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Correct two stale arity claims in the brand witness prose - #10493

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Stacked on #10337 — the file this touches is introduced by #10337, so this cannot be based on
main without recreating it. Until #10337 lands, this PR's diff shows #10337's commits too; once
#10337 merges it reduces to the four lines below.

review 60514 caught two stale §4c annotations in the brand witness:

line claim reality
33 "WHY FOUR ARMS AND NOT ONE" six arms are enrolled, and b_all_six_arms_are_enrolled asserts it
73 "THE FOUR FIXTURES ARE INVALID PROGRAMS" three of the six are accepting arms, which are valid programs

Both are annotations making false structural claims inside the file whose entire purpose is a
wall's honesty, so they do have to go — but not at the cost of a green head on the PR that carries
the wall itself, while twenty open PRs contend on one ledger file.

Corrected to six, and the invalid-program claim narrowed to the refusing arms with the accepting
half named explicitly rather than silently excluded.

Prose only. No assertion, fixture, or class-filter change.

🤖 Generated with Claude Code

https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74

Brian Searls and others added 30 commits September 3, 2026 21:55
…t decides it

A where-refinement predicate is a bare identifier with no declaration
binding anywhere in the pipeline: 02_parse accepts any identifier in its
unparenthesised arm, and 04_infer decides what it MEANS by matching that
string against three hand-written name-keyed tables. So the tables are a
second authority for a predicate's meaning, forked from the declaration
that already states it wherever one exists.

Census over all 4663 .dag files: 271 declaration sites, 15 distinct
predicate spellings. Seven are grounded by a declared total Bool function
and eight are not, and the compiler's treatment does not track that split
in either direction. Three grounded, decidable String -> Bool predicates
are in no table at all -- two of them declared in the same file as an
enrolled pair -- so a plainly invalid literal at those refined positions
compiles with zero refusals, while the enrolled siblings wall.

This lands the join that did not exist: one row per spelling carrying the
compiler's enforcement class and whether a declaration grounds it, and a
witness that executes every row against the real v1 compile path. The
join runs in both directions by spelling, so a spelling added to one side
alone reds rather than being skipped, and the three unenrolled rows are
held as a monotone debt contract at spelling grain -- enrolling one
without deleting its row reds, adding a fourth reds.

Honest at rung 2, mechanically preventable, and the row says so: the
invalid state stays writable and safety depends on the witness staying
enrolled. The observable is the two-way partition {refuses a violating
literal} vs {never refuses}, because the census surface projects a
diagnostic's class and subject name but not its reason; the four-way
class split is author-vouched and the file states which half executes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
…hread

Asked the lane carrying gunbc#10146 whether its ResolvedFormal /
DeclarationBoundFormals coproduct generalises from call formals to
where-predicates. It does not, and the reuse was refused: its fields are
parameter_identity, declared_type, declaration_bound_conformance and
substitution_basis, and its consumers depend on formal-to-argument
correspondence, so a predicate inhabiting it would give those four fields
a second meaning under one name -- the DESIGN section 3 fork this row
exists to close, re-created while closing it.

What generalises is the pattern, not the carrier, so the predicate move
owes its own substrate carrier keyed by DeclarationRef rather than
spelling, as a follow-on after #10146 rather than folded into it.

This lands in the dissolution-trigger row because a refusal that lives
only in a chat message is not an authority: the next person to propose
the reuse would not find it, and would re-derive the fork the refusal
prevented.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
The floor refused at parse with 45 errors, all in these two files, all one
class: DESIGN section 4c admits only standalone leading // blocks attached
to module-scope declarations. I had field notes inside a type body, a note
inside a data list literal, and a trailing ceiling block with no
declaration after it. Each is moved above the declaration it describes; no
prose is lost and none of it changes meaning.

Also adds NonEmptyStr to the std.types import. The roster used it in
where_predicate_decl without importing it, which produced two
unlisted-import-use advisories -- rows in a class this lane does not own
and therefore has no business creating.

WHY THE LOCAL RUN MISSED IT, since the instrument gap is the reusable part:
an entry-closure run (--entry <witness> --claim-run) resolves and executes
the witness without applying the annotation-grain rule, so all seven
assertions passed green against the real corpus while the file was
inadmissible to the compile-clean gate. Those are two different claims. A
whole-tree `gunbc compile --source-root dag --source-root src/v2 --target
dag` DOES apply it, reports zero annotation errors here, and is what
verified this fix before it was pushed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
The floor passed and required_floor_disposition.tsv shows all seven
identities as planned_as_changed_witness / passed -- so they executed, and
were not selected out. But they are the ONLY seven rows of that
disposition in a 15984-row floor, and the arm name says why: they ran
because these files CHANGED. The floor's other arms are 3595 planned
(inside the gate closure) and 11824 declined_outside_gate_closure.

The sibling settles which arm this lands in once it stops changing.
test.claim.compile_diagnostic_census_witness -- same directory, same host
builtin, the module this witness was modelled on -- is
declined_outside_gate_closure on that same run. So this is a
change-triggered control, not a continuously-executing one, and the
roster's claim that safety depends on the witness "executing and staying
enrolled" was reading as more than the evidence supports.

The consequence is narrower and worse than the general point, so both
files now state it: an edit to this roster or the witness re-runs the
join, but AN EDIT TO THE COMPILER'S CLASSIFIER TABLES DOES NOT. The join
reaches the compiler through the compile_dag_diagnostic_census host
builtin rather than an import edge, and src/v1 is not a source root under
the required floor, so v1.compiler.infer cannot appear in this module's
closure at all. Enrolling a sixteenth predicate without touching either
file would not red. The wall catches ROSTER drift, not COMPILER drift, and
only the latter is the side that moves when someone enrols a predicate.

Next-rung trigger is named as the capability: this module inside the
required gate closure, reached from the gate seeds rather than by having
been edited, sufficient for the join to execute on runs that touch neither
file.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
The brief required the witness cover the collision case -- a spelling
standing for more than one declared meaning must go loud -- and
w_roster_spellings_are_pairwise_distinct already did, since two rows
claiming one spelling is how a second meaning enters the roster. But the
file described it as a byproduct of the bidirectional join rather than as
the collision wall, so a reader could not tell that was its purpose and
nothing said what population it ranges over. An assertion that satisfies a
requirement without being legible as satisfying it is how a check later
gets cited for coverage it does not have.

It now says both halves. It ranges over the ROSTER and catches a spelling
given two groundings there. It does NOT range over the corpus: two
declarations claiming one predicate name where neither reaches this file
are invisible to it, for the same reason the membership half is
author-vouched -- no substrate reader projects where-clause predicates, so
there is nothing to join the corpus against.

The corpus is collision-free as measured at authoring time -- 15 spellings
each denoting one thing, and 230 brand("...") literals all distinct -- and
it is held that way by authoring diligence, rung 1, not by this witness.
That is stated in the file rather than left as an impression, because the
earlier draft of this lane's report called name-keyed predicate identity
"silent wrongness" when nothing in the tree currently triggers it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
A `where brand("...")` refinement is a NOMINAL claim: two independently
declared types are different types. v1.compiler.infer decided brand identity
by comparing the LITERAL STRING -- where_refinement_predicates_equivalent
dispatched Brand to where_predicate_literal_string_args_match -- so two
declarations sharing a spelling were ONE type, and a cast between them was not
merely unenforced, it was not a cast at all. DESIGN section 3's meaning fork
with the halves swapped: not one concept wearing two names, but one name
silently merging two concepts.

THE COLLISION WAS AUTHORED HERE AND ACCEPTED SILENTLY. gunbc.fleet
fleet_site_locale carries an annotation recording that its first revision
minted a second HostIdentity beside product.placement_supply's, calling it the
single-authority violation in its canonical form, and stating that it DID NOT
SURFACE AS A DUPLICATE-DECLARATION DIAGNOSTIC. A person caught it and wrote the
incident into prose because there was no mechanism to write it into.

Brand equivalence is now decided where BOTH resolved types are in hand, in
where_refinement_mismatch_diags, and refuses only when both sides carry a Brand
predicate AND their declaring ident spans provably differ. The refusal reuses
type_mismatch_error -- the same TypeMismatch the refinement path already emits,
so no second authority for one meaning.

THE KEY IS THE DECLARING IDENT SPAN AND DELIBERATELY NOT Node.occurrence_identity.
Occurrence identity makes the collision refuse and ALSO makes a type stop being
itself when reached from a second use site, silent in the opposite direction --
and it is the live subject of the namespace/type-occurrence cutover.

MEASURED, four arms, `gunbc compile --source-root dag --source-root src/v2
--entry <fixture> --target dag`, before and after:

  collision  two decls one literal, cast between   0 rows        -> RC=1 blocking
  mismatch   two decls two literals, same cast     1 advisory    -> RC=1 blocking
  construct  String asserted into a brand          1 advisory    -> unchanged
  dual       one decl reached from two use sites   clean         -> unchanged

construct and mismatch emitted the IDENTICAL deferred advisory beforehand, so
the diagnostic separated a violation from a correct construction not at all.
That is why "make the Brand advisory blocking" is not a candidate wall: it would
refuse every construction site in the corpus and distinguish none of them.
construct keeping its advisory verbatim is the evidence the wall did not swallow
the base-to-brand assertion; dual staying clean is the evidence the key is
stable across occurrences.

NOTHING IN THE CORPUS REFUSES. Annotation-erased census over dag and src: 236
brand declarations, 236 distinct literals, zero duplicates. Authority move, not
a replacement migration. The erasure is load-bearing -- a raw grep reports four
duplicates and all four second sites are `//` prose, which section 4c makes a
structural correction since semantic passes see the annotation-erased projection.

Admitted against the v1 freeze by PURPOSE on gunbc.v1_maintenance_standing
v1_seed_standing: 236 declarations carry an identity v2 must eventually ingest
and would otherwise inherit wrong. No hand-authored Rust is added -- the stage0
mirror is regenerated -- so seed_growth_admission has nothing to admit.

RUNG HONESTY. The collision class reaches structural refusal on the
source-to-interpretation path; mismatch refusing is a separate and weaker claim,
since Brand remains a deferred predicate, now deferred over a real identity. Per
4b(4) the two expecting-red arms do not retire on the climb -- they become
permanent regression controls, and the two accepting arms are what prove the
wall did not swallow legitimate construction.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
…t builtin

The import list named compile_dag_diagnostic_census as an export of
gunbc.compile_diagnostic_census. It is a HOST BUILTIN and that module does not
export it -- the sibling witness using the same builtin imports only the types
and the row helpers. So the file failed to compile and none of its five
assertions ran.

WHY EVERY SIGNAL I HAD WAS COMPATIBLE WITH THIS. I verified the wall by running
the four arms as DIRECT FIXTURES, which proves the COMPILER refuses correctly
and is silent on whether the witness enrolling that proof works. Those are two
claims and I collapsed them. A witness that fails to compile emits no advisories
(a file that does not compile contributes none), fails no assertions (none run),
and is ABSENT from the floor disposition rather than failing in it -- so fmt,
the push, the arms and a source-reading APPROVE were all green over a dead file.

It surfaced from a whole-tree census run aimed at an unrelated question, as
blocking error number one. That is the recognition rule: if the only thing that
would have caught it is a run aimed at something else, the class has no
dedicated detector. The one instrument that sees it is a whole-tree compile
INCLUDING the test roots.

All five assertions now execute and pass under
`gunbc run --entry <witness> --claim-run --function <fn>`:

  b_all_four_arms_are_enrolled                PASS
  b_arm_names_are_pairwise_distinct           PASS
  b_every_arm_behaves_as_declared             PASS
  b_collision_and_dual_are_distinguished      PASS
  b_mismatch_and_construct_are_distinguished  PASS

Corrects the census receipt sent alongside this work: 37 blocking are
pre-existing in the corpus and 1 was mine. Advisory figures are unaffected --
17368 total, 8345 unlisted-* at 48.0% -- because a file that fails to compile
contributes no advisories either.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
…ABSENT, not red

INVALID STATE: a claim file is committed, reviewed and merged while it cannot
compile, so none of its assertions execute and the guarantee it was written to
carry does not exist.

WHY IT IS A CLASS AND NOT A SLIP: every ordinary signal is compatible with the
dead file and none of them is malfunctioning. It emits no advisories, because a
file that does not compile contributes none. It fails no assertions, because
none run. It is ABSENT from the floor disposition rather than failing in it, so
a disposition read shows nothing to investigate. fmt is green, the push is
green, and a reviewer can APPROVE on a correct reading of the source, because
READING DOES NOT COMPILE.

THE CORE IS A TWO-CLAIM COLLAPSE. "The compiler behaves correctly" and "the
witness that enrols that behaviour as executing evidence works" are different
claims; running the subject as a direct fixture establishes only the first. The
mechanism of the misread is that holding the stronger claim's output makes the
weaker one feel answered -- the author has passing fixtures in hand, which is
exactly why the file meant to carry them never gets checked.

RECOGNITION RULE: ask what would have caught it, and if the only answer is a run
aimed at a DIFFERENT question, the class has no dedicated detector. This
specimen surfaced from a whole-tree advisory census re-derivation chasing an
unrelated hypothesis about a denominator, as blocking error number one, after
the arms were green and an APPROVE was already recorded.

Rung found at 1. Ceiling 3: the population is decidable and closed -- every file
under the claim roots -- so a required step that compiles them and refuses a
non-compiling claim file makes the state unwritable in an Accepted tree. The
trigger names that capability and not an artifact, because an execution roster
keyed to compiling files cannot see a file that fell out of it, which is the
same shape as a check whose population IS its own roster.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
… into it

Main split gunbc.recurring_failure_mode from a single 448KB module into one file
per class under dag/gunbc/recurring_failure_mode/, with the row shape changing
from `authored: String` to `receipts: List<String>` and the enumeration moving
to a separate roster module. Git presented that as an ordinary content conflict.

BOTH INSTINCTIVE RESOLUTIONS WERE WRONG. Keeping ours resurrects the 83 rows
main deliberately moved, silently reverting a structural cut. Keeping theirs
drops the row this branch filed.

A three-way census by ROW IDENTITY is what made it visible: base=83, ours=84,
theirs=0, with "deleted by theirs" listing all 83. A zero on one side is either
a deletion or a broken instrument, and here it was neither -- it was a
RELOCATION the identity regex could not see, which is the projection-split-
merges-as-a-rename shape.

Resolution: adopt main's structure wholesale, and re-file this branch's row as
its own module in the new shape, appended at the END of the roster because order
there is load-bearing -- the projection renders in roster order, and sorting
would destroy the empty-diff oracle that proves the cut was structural.

docs/design-failure-modes.md was regenerated from the merged authorities rather
than hand-resolved, per the merge driver's own printed recipe; the row's
presence in the generated doc is verified by grep, not inferred from RC=0.
Roster completeness re-checked at identity grain: 96 row files, 96 roster
imports.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
… for heal

Append-versus-append on gunbc.recurring_failure_mode.roster: censused all three
stages by row identity before resolving -- base=95, ours added
witness_that_fails_to_compile_is_absent_rather_than_red, theirs added
guard_precondition_discharged_by_the_route_that_uses_it, and NEITHER SIDE
DELETED ANYTHING. Union is correct here, and it was checked rather than assumed:
"keep both sides" is right nine times and silently reverts the tenth.

Both rows appended at the end, main's first, because roster order is load-bearing
-- the projection renders in roster order and sorting destroys the empty-diff
oracle. Join re-checked at identity grain with roster.dag excluded from the
numerator, since it is the enumeration and not a row: 97 row files, 97 imports.

docs/design-failure-modes.md is staged as an explicitly PROVISIONAL projection,
per the merge driver's own instruction on this merge: do not regenerate it
locally; heal-generated-artifacts derives it from the merged authorities, pushes
the healed head, and the generated-artifact gate must then agree on that exact
head.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
…se -> brand stays legal

The brand nominal-identity wall refused `x as String as X`, because it asked
`where_refinement_value_under_cast` for the actual type and that helper peels
through EVERY cast in a chain -- correct for a literal-argument predicate, wrong
for a nominal brand, where the immediate operand is the whole question. Four
corpus-authored sites in src/v2/extdeps/formats/spice_passive_projection.dag
spell exactly that, and the required floor refused them.

The check now reads `resolved_type(n: value_expr)` -- the unpeeled operand --
and reports it in the diagnostic's `got:` field.

The root cause was an INCOMPLETE PARTITION of the accepting cases: `construct`
covered base -> brand and `dual` covered one declaration referenced twice, and
neither covered brand -> base -> brand. So a fifth arm `strip` and the
regression control b_strip_is_accepted_where_bare_mismatch_refuses are enrolled
here; per DESIGN.md 4b(4) that control does not retire when it greens.

Evidence, all on the rebuilt seed:
  collision RC=1 blocking  mismatch RC=1 blocking
  construct RC=0           dual RC=0            strip RC=0
  positive control: the real spice_passive_projection.dag compiles, RC=0,
  zero blocking, all four sites back to advisory -- the check that separates
  "the wall works" from "the wall is gone".

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
# Conflicts:
#	dag/gunbc/recurring_failure_mode/roster.dag
#	docs/design-failure-modes.md
…-bytes route deleted two rows

The generated-artifact driver REFUSES rather than answering -- it leaves the ours
side in the worktree with no conflict markers and marks the path unmerged. So the
worktree read shows a clean, well-formed, already-resolved-looking file, and step 1
of the printed route (`git add` the driver-left bytes) commits that side over
main's, deleting rows it never mentions.

Measured on this head before the fix: main 98 projection rows, this branch 97,
authority 99. The two that went dark were denominator_moved_between_measurement_and_comparison
and absent_reads_identically_to_never_looked -- both main's, neither named in any
diff I read, and invisible to every gate: this would have merged clean.

Taking main's projection verbatim leaves the tree authority-ahead by this branch's
own single row and DELETING NOTHING, which is the benign shape heal is built to
close. It hand-authors nothing and cannot get the append order wrong.

A count does not catch this. The check is the set difference, which names WHICH
rows went dark:
  comm -23 <(main rows) <(head rows)   must be empty

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
…key is no longer representable

The wall admitted a cast it could not adjudicate. `where_refinement_brand_declaration_key`
returned "" for a type with no declaring span and the consumer guarded on `key != ""`, so
"I cannot tell which declarations these are" was spelled as a value and read as permission.

THIS WAS LIVE, NOT THEORETICAL. `fn f(a: String where brand("x"))` is an inline brand-carrying
type with no declaration site; it parses and compiles. Through it, brand `q_inline` flowed into
brand `q_b` -- the exact violation the `mismatch` arm exists to refuse -- and the file COMPILED
CLEAN. A hole in a wall emits no diagnostic, so no red existed for review to find: three reviews
read this diff and approved it, including one that described the partition as correct.

THE ROOT WAS THE RETURN TYPE, NOT THE ARM. `Bool` carried a three-valued question -- distinct
declarations, same declaration, cannot determine -- so the third collapsed onto `false` with the
second, and `false` admits. Fixing only the sentinel would have left the next consumer free to
re-derive the same collapse.

  - the key producer returns `String?`; an undeterminable key is NOT REPRESENTABLE
  - the predicate returns `BrandNominalVerdict`, four named variants, so no consumer can
    inherit an answer from a magic value
  - the undeterminable arm REFUSES via `inference_error` -- typed, located, and a DISTINCT
    diagnostic from TypeMismatch so the two populations never merge

Per DESIGN 4b this is construction over validation: the invalid state loses its constructor
rather than gaining a check.

Evidence, all on the rebuilt seed (six arms, three refusing and three accepting):
  collision RC=1   mismatch RC=1   undeclared_site RC=1 (was RC=0 -- the hole)
  construct RC=0   dual RC=0       strip RC=0
  positive control: real spice_passive_projection.dag RC=0, zero blocking, zero mismatches
  seven witness assertions PASS, including b_undeclared_site_refuses_like_a_declared_mismatch

The specimen is appended to the existing `state_space_conflation` row rather than minting a new
class -- its recognition rule already covers a value meaning more than one thing. Two things this
specimen adds: the collapse direction here was toward the ADMITTING value, so the type's
inadequacy IS the safety hole rather than a symptom of one; and it was found by EXECUTING a
fixture, where that row's earlier receipts were all found by reading the producer.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
# Conflicts:
#	dag/gunbc/recurring_failure_mode/roster.dag
#	docs/design-failure-modes.md
# Conflicts:
#	dag/gunbc/recurring_failure_mode/roster.dag
#	docs/design-failure-modes.md
#	src/v1/stage0/src/v1_compiler_infer.rs
…ng main

The merge brought #10402's 04_infer changes alongside the brand-verdict work.
Two derived artifacts had to be re-derived rather than hand-resolved:

- docs/design-failure-modes.md re-derived from the merged authorities
  (generated_artifact_gate main_wet), with the base side taken verbatim first
  rather than the driver-left ours bytes.
- src/v1/stage0/src/v1_compiler_infer.rs regenerated via
  claim_executor --required-regen. Pass 1 reported drift
  (first_generation_equal=false); pass 2 after rebuild reports
  first_generation_equal=true over 156 adjudicated files. This incorporates the
  regeneration #10402 landed without.

roster.dag resolved by counted union and verified by identity join: no row dark
on either side, no duplicates, no inventions.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
# Conflicts:
#	src/v1/stage0/src/v1_compiler_infer.rs
# Conflicts:
#	docs/design-failure-modes.md
#	src/v1/stage0/src/v1_compiler_infer.rs
# Conflicts:
#	dag/gunbc/recurring_failure_mode/roster.dag
#	src/v1/stage0/src/v1_compiler_infer.rs
Brian Searls and others added 15 commits September 4, 2026 20:03
…sion/calm-eagle-759

# Conflicts:
#	docs/design-failure-modes.md
…irror

required-regen named three drifted stage0 mirrors; the previous cycles installed
only v1_compiler_infer.rs, the file expected to drift. std_measure.rs and
compiler_tests.rs are inherited drift from #10273, which hand-maintained two
emitted mirrors instead of regenerating them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
# Conflicts:
#	dag/gunbc/recurring_failure_mode/roster.dag
#	src/v1/stage0/src/compiler_tests.rs
#	src/v1/stage0/src/v1_compiler_infer.rs
The merge took main's side of compiler_tests.rs and v1_compiler_infer.rs, which is
correct for an emitted mirror, and the regen then reproduced them from the merged
emitter. These are those bytes.

required-regen: first_generation_equal=true, 156/156 adjudicated.
Fixed-point check agrees.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
codex review 60451: the arms counted every blocking diagnostic in the compile
census, but gunbc.compile_diagnostic_census states the row set is the whole
compile's and that only a count scoped to a class -- or a differential -- is
exact. A bare `blocking >= 1` would stay green if the nominal check regressed
while an unrelated refusal appeared in its place.

Each arm now declares the class it expects (TypeMismatch for the cast arms,
InternalError for the undeterminable-site arm) and the refusing assertion is
`targeted >= 1 && targeted == total_blocking`, so an unrelated blocking
diagnostic reds the arm rather than satisfying it. The accepting arms keep a
TOTAL count, because "accepted" must mean no blocking diagnostic of any class.

Falsifier: perturbing expect_class to UnresolvedType turns
b_every_arm_behaves_as_declared, b_collision_and_dual_are_distinguished and
b_mismatch_and_construct_are_distinguished RED (RC=1); all seven are green with
the correct classes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
# Conflicts:
#	dag/gunbc/recurring_failure_mode/roster.dag
Ledger-Repair-Judged: docs/design-failure-modes.md
Ledger-Rows-Repaired: docs/design-failure-modes.md state_space_conflation
Ledger-Rows-Repaired: docs/design-failure-modes.md witness_that_fails_to_compile_is_absent_rather_than_red
Ledger-Repair-Judged: docs/design-rung-drops.md
…sion/calm-eagle-759

# Conflicts:
#	docs/design-failure-modes.md
Ledger-Repair-Judged: docs/design-failure-modes.md
Ledger-Rows-Repaired: docs/design-failure-modes.md state_space_conflation
Ledger-Rows-Repaired: docs/design-failure-modes.md witness_that_fails_to_compile_is_absent_rather_than_red
Ledger-Repair-Judged: docs/design-rung-drops.md
review 60514: the header said "WHY FOUR ARMS AND NOT ONE" while six arms are
enrolled, and "THE FOUR FIXTURES ARE INVALID PROGRAMS" described a set that now
includes three accepting arms, which are valid programs.

Both are §4c annotations making false structural claims in the file whose whole
purpose is a wall's honesty. Corrected to six, and the invalid-program claim
narrowed to the refusing arms with the accepting half named explicitly.

Prose only; no assertion, fixture or class filter changes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018WC97AtZWzFxLktD4LfF74
…9-prose

# Conflicts:
#	dag/test/claim/brand_nominal_identity_witness_test.dag
@gunbai-bot
gunbai-bot Bot merged commit 9d06abd into main Sep 5, 2026
4 checks passed
@gunbai-bot
gunbai-bot Bot deleted the session/calm-eagle-759-prose branch September 5, 2026 01:20
@briansrls
briansrls restored the session/calm-eagle-759-prose branch September 5, 2026 01:25
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