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fix(bin): fold routed activity without forking per status line - #6
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status_open_activities ran four command substitutions per status line, and its expensive branch was the most common verb, so the fold cost lines x 4 forks. Its only caller reads a secondmate's parent-channel activity under a fixed 2s wall-clock budget, and on a platform where a bare subshell costs tens of milliseconds that budget was exceeded on every poll and by more as the log grew. The timeout path returns well-formed JSON carrying available:false, so the evidence was dropped with no error, no notification and no diagnostic line, and the busiest mate - having the longest log - was the most reliably invisible. Take the out-var form of status_line_verb, add out-var forms to _fm_key_at_note_head, status_line_note and _fm_decision_key beside their existing printed forms, fold _fm_decision_drop in place, and hoist the key lookup behind the verb test the way _fm_decision_fold_line already does. _fm_decision_drop also splits its set with parameter expansion instead of a here-document, which on a per-line caller was a filesystem round trip per line. Behaviour is unchanged: every touched surface, both folds, the streamed form and every incremental prefix of a mixed corpus produce byte-identical output before and after, including the timeout path. Measured on the reporting platform, the child script the budget wraps, at 20 / 120 / 256 status lines: 4.67s / 22.77s / 48.39s before, 1.72s / 1.89s / 1.70s after - flat in log length rather than super-linear. Under the real 2s budget it went from a timeout at every size to available:true at every size. The budget is deliberately left at 2s: it was never the defect, and raising it would only move the same silent failure further out. The new suite pins the cost shape rather than a millisecond count, by charging the fold against the CPU the shell spends on reaped children - so it is honest on a fast runner and a slow one alike, and it fails on the pre-fix code by a factor of 30.
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Intent
Fix the first of the three hazards found by the wall-clock budget audit at
data/fm-budget-audit-w1/report.md, section 3.1. Read that section beforestarting; it is the evidence base and it names the fix precisely.
The substance, so this brief stands alone:
bounded_parent_activities_json(bin/fm-fleet-snapshot.sh:1488) is the onlyreader of a secondmate's parent-channel activity, and it runs under
FM_SNAPSHOT_PARENT_ACTIVITY_TIMEOUT, a 2-second budget atbin/fm-fleet-snapshot.sh:1558. On this platform that work was measured at3.26s with 20 status lines and 17.66s with 120. The budget is therefore blown
every single time, and gets worse as the log grows.
The consequence is the reason this was funded ahead of the other two. On
timeout the function returns well-formed JSON carrying
available:false, reasons:["timeout"]and the snapshot proceeds normally, soevery secondmate's routed-activity evidence is dropped with no error, no
notification and no diagnostic line. It does not self-heal on the next poll.
It is also load-correlated in the worst direction: the busiest mate has the
longest log and is therefore the most reliably invisible.
The code is correct - it produced fully correct output at both input sizes.
Only the clock is wrong. Raising the number is explicitly NOT the fix, because
the cost is super-linear in log size and any larger constant fails again later,
just as silently.
This is portable robustness hardening rather than a Windows workaround: any
sufficiently slow or loaded host reaches the same threshold.
What Changed
_fm_key_at_note_head,status_line_note,_fm_decision_key, and_fm_decision_dropinbin/fm-classify-lib.shnow take an optional out-var and assign withprintf -vinstead of only printing, and_fm_decision_dropsplits its record set with parameter expansion rather than a here-document._fm_status_open_activities_streamcalls all of them through the out-var forms, so the routed-activity fold no longer spends four command substitutions per status line; the out-var form of_fm_decision_dropalso returns the set newline-terminated, dropping the caller's manual re-append.tests/fm-classify-activity-fold-cost.test.sh, which pins the fold's cost shape rather than its output: it counts child-process CPU fromtimes(no clock, no forks in the measurement path) across the real public fold at the shipped 256-line window and at 1024 lines, requiring the fold to stay 8x under one bare subshell per line at both sizes.bin/fm-test-run.shregisters the new script with a 7423 ms duration hint and routesbin/fm-classify-lib.shchanges to the fold-cost and decision-key scripts alongside thewatcher-wake-lockfamily;docs/fm-test-portable-shards.mdrecords that hint as a labelled local stopgap pending a CI refresh.Risk Assessment
✅ Low: The change is a semantics-preserving hot-path optimization that I verified byte-identical against the base across both folds, the streaming form, every incremental prefix of a mixed corpus and a wide set of malformed/edge status lines, it delivers the intent's required fix (80.2 s -> 1.82 s at 256 lines) without touching the timeout the intent forbids raising, its regression suite asserts observable fold output plus a clock-free fork invariant rather than source text, and the runner wiring, hint row and provenance are internally consistent; the only outstanding concern is a residual cost axis already recorded as out of scope.
Testing
I derived the scenarios from the intent's stated hazard - a secondmate's routed-activity evidence silently dropped because the fold spent a process per status line under a fixed 2 s budget - and drove every one of them against the real product on this Windows/Cygwin host, where forks are expensive enough for the defect to be visible. Baseline: the new fold-cost suite and the existing decision-key suite both run green on the target, and the fold-cost suite fails as designed when pointed at the pre-fix classifier, so it is a real fail-before/pass-after regression test rather than a tautology. End-to-end, bin/fm-fleet-snapshot.sh --json over a fixture fleet with a 256-line parent-channel log went from available:false, reasons:["timeout"] with zero records to available:true with all nine phase records, and bin/fm-bearings-snapshot.sh dropped its "secondmate parent activity evidence unavailable for 1 record(s)" omission - the operator-visible half of the symptom. The read cost, timed exactly as the snapshot runs it, went from 7.2/32.3/69.9 s at 20/120/256 lines to 3.19/2.89/3.12 s, i.e. flat instead of super-linear, with identical records at every size. Adversarially, raising the budget 10x to 20 s over a 1024-line window still times out pre-fix and succeeds post-fix, which is the intent's claim that a larger constant is not the fix; and a byte-level differential over three crafted corpora confirms the out-var rewrite, including the _fm_decision_drop newline change and prefix-sharing keys, changes no classifier output. I also confirmed the changed-file map now routes a classify-lib edit to both classifier suites. Two things I could not clear locally and reported as informational only: at the shipped 2 s budget this host still times out post-fix, which I measured down to three jq startups (~1.7 s) rather than the fold (~0.24 s) and which matches the separately-filed out-of-scope residual; and --check-coverage exits 1 identically at base and target here from a comm/locale mismatch, so CI owns that verdict. No screenshot or rendered-UI artifact applies: every surface this change touches is CLI/JSON and TOON text output, captured as transcripts instead.
bin/fm-fleet-snapshot.sh --jsondriven over a fixture fleet home (drive-parent-activity.sh); snapshot-fixed-timeout10.txt vs snapshot-base-timeout10.txtbin/fm-bearings-snapshot.shover the same fixture fleet: omitted[9] carrying "secondmate parent activity evidence unavailable for 1 record(s)" at base, omitted[8] without it after; bearings-base-256…FM_SNAPSHOT_PARENT_ACTIVITY_LINES=1024snapshot runs at a 20 s budget against both classifiers; raising-the-constant-is-not-the-fix.txtbash tests/fm-classify-activity-fold-cost.test.shagainst a base-classifier tree (not ok - wide fold ... it is forking per status line again, exit 1) and against the target (both cases ok); fold-c…bash tests/fm-classify-decision-key.test.sh- 20 cases green, covering both stated-key positions, malformed-vs-missing slugs, note-head key stripping and the incremental foldbash bin/fm-test-run.sh --list --changedwith bin/fm-classify-lib.sh modified; changed-file-selection.txt lists fm-classify-activity-fold-cost.test.sh and fm-classify-decision-key.test.sh alongside…Evidence: Evidence index for this run
Source: Evidence index for this run
Evidence: Parent-activity read cost, pre-fix vs post-fix, timed as the snapshot runs it
Source: Parent-activity read cost, pre-fix vs post-fix, timed as the snapshot runs it
lib lines rc cost_ms records_in_window base 20 0 7192 9 base 120 0 32290 9 base 256 0 69890 9 fixed 20 0 3193 9 fixed 120 0 2894 9 fixed 256 0 3120 9 # Where the post-fix 3.0 s still goes on this host (none of it the fold): bash -c + source bin/fm-classify-lib.sh : 372 ms the same, plus the whole 256-line fold : 614 ms the three jq startups the child also pays : 1710 msEvidence: fm-fleet-snapshot.sh --json, pre-fix: routed activity dropped at 256 lines
Source: fm-fleet-snapshot.sh --json, pre-fix: routed activity dropped at 256 lines
--- 256 routed status lines --- activity_scan : {"records":[],"available":false,"input_truncated":false,"retained_truncated":false,"reasons":["timeout"],"lines_in_window":0,"records_in_window":0} open_activities : []Evidence: fm-fleet-snapshot.sh --json, post-fix: all nine phase records published at 256 lines
Source: fm-fleet-snapshot.sh --json, post-fix: all nine phase records published at 256 lines
--- 256 routed status lines --- activity_scan : {"records":[{"key":"phase4","verb":"working","summary":"step 247 under way on the parent channel"}, ... ],"available":true,"input_truncated":false,"retained_truncated":false,"reasons":[],"lines_in_window":256,"records_in_window":9} open_activities : ["phase4=working","phase5=working","phase6=working","phase7=working","phase8=working","phase0=working","phase1=working","phase2=working","phase3=working"]Evidence: Operator's Bearings report, pre-fix: routed-activity evidence disclosed as unavailable
Source: Operator's Bearings report, pre-fix: routed-activity evidence disclosed as unavailable
omitted[9]{surface,reveal}: ... secondmate parent activity evidence unavailable for 1 record(s),inspect the parent status logs live PR discovery + checks,"--include-prs"Evidence: Operator's Bearings report, post-fix: that omission is gone
Source: Operator's Bearings report, post-fix: that omission is gone
omitted[8]{surface,reveal}: ... "secondmate registry unavailable: registered secondmate table read timed out",inspect data/secondmates.md live PR discovery + checks,"--include-prs"Evidence: Adversarial: a 10x larger budget is still not a fix
Source: Adversarial: a 10x larger budget is still not a fix
### BASE lib (pre-fix): 1024-line window, budget raised 10x to 20s activity_scan : {"records":[],"available":false,...,"reasons":["timeout"],"records_in_window":0} ### FIXED lib (this change): same window, same 20s budget activity_scan : {...,"available":true,"reasons":[],"lines_in_window":1024,"records_in_window":9}Evidence: The new cost suite fails against the pre-fix classifier
Source: The new cost suite fails against the pre-fix classifier
# tests/fm-classify-activity-fold-cost.test.sh run against the PRE-FIX bin/fm-classify-lib.sh (base f1fc96e) not ok - wide fold: the fold charged 11354cs of child CPU over 1024 lines, against a budget of one subshell per line (160cs per 64 forks) with a 8x margin - it is forking per status line again exit=1Evidence: Base-vs-fixed classifier output differential (two corpora, three fold entry points)
Source: Base-vs-fixed classifier output differential (two corpora, three fold entry points)
IDENTICAL base vs fixed: status_open_activities (named-file form and streaming form) BYTE-IDENTICAL base vs fixed: status_open_decisions (189 bytes of output, named-file and streaming forms) BYTE-IDENTICAL base vs fixed: status_open_decisions_incremental (189 bytes of output, named-file and streaming forms)Evidence: Adversarial corpus for the _fm_decision_drop rewrite (prefix keys, set emptying and refilling)
Source: Adversarial corpus for the _fm_decision_drop rewrite (prefix keys, set emptying and refilling)
BYTE-IDENTICAL base vs fixed (named-file and streaming forms) records the fixed fold publishes (TAB shown as ->): phase10 -> working -> ten phase100 -> working -> hundred ab -> working -> ab refill -> working -> refilled after empty empty-note -> working -> tabless-note -> working -> note with doubled spaces prefix-sibling records still open: 2 phase1 correctly closedEvidence: Changed-file selection routes a classify-lib edit to both classifier suites
Source: Changed-file selection routes a classify-lib edit to both classifier suites
# bin/fm-test-run.sh --list --changed with bin/fm-classify-lib.sh modified ... (watcher-wake-lock family) ... tests/fm-classify-activity-fold-cost.test.sh tests/fm-classify-decision-key.test.shEvidence: Known residual: shipped 2 s budget on this Cygwin host still times out post-fix
Source: Known residual: shipped 2 s budget on this Cygwin host still times out post-fix
Evidence: Driver: stands up the fixture fleet and drives fm-fleet-snapshot.sh
Source: Driver: stands up the fixture fleet and drives fm-fleet-snapshot.sh
Evidence: Driver: same fixture through the operator's Bearings report
Source: Driver: same fixture through the operator's Bearings report
Evidence: Driver: times the snapshot's own parent-activity child script
Source: Driver: times the snapshot's own parent-activity child script
Pipeline
Updates from git push no-mistakes
✅ **intent** - passed
✅ No issues found.
✅ **Rebase** - passed
✅ No issues found.
bin/fm-test-run.sh:1382- The newbin/fm-classify-lib.sharm offamilies_for_changed_pathselectswatcher-wake-lockplus__script__:fm-classify-activity-fold-cost.test.sh, but nottests/fm-classify-decision-key.test.sh- the suite that pins the exact semantics this change rewrote. That script is in thepure-contract-unitfamily (bin/fm-test-run.sh:281) and its header states it drivesstatus_line_verb/status_open_decisions/status_open_decisions_incrementalover crafted status files, which is the only coverage for_fm_decision_key's malformed-vs-missing slug distinction,status_line_note's note-head key stripping, and_fm_decision_drop's printed form - the three function bodies rewritten at bin/fm-classify-lib.sh:417-455 and 469-489. Concrete sequence: a developer reintroduces a divergence in the rewritten_fm_decision_key(e.g. returningdefaultinstead of failing on a malformed note-head slug), then runsbin/fm-test-run.sh --changed; the case arm matches first and returns only the two entries above, so the decision-key suite never runs and the local gate passes green. This is a local-gate gap only -list_portable_serialderives membership, so the full CI lane still runs it - which is why this is info rather than a warning. The routing gap predates this change (the base arm emittedwatcher-wake-lockalone), but it is newly material because this change is precisely a semantics-preserving rewrite of those helpers, and the arm was edited here. Narrow remedy: addprintf '%s\n' "__script__:fm-classify-decision-key.test.sh"to the same arm, the one-script mechanism already used at bin/fm-test-run.sh:1337 and 1384. Flagged as ask-user rather than auto-fix because round 3 settled this arm's contents explicitly ("do not change what the arm already selects"), so extending it is the author's call, not a mechanical correction.🔧 Fix applied.
1 info still open:
bin/fm-classify-lib.sh:491- Recording a measurement, not re-opening a decision._fm_decision_drop's new split rebuilds the remainder on every record (set=${set#*$'\n'}), so each call is quadratic in open-set size, and the fold calls it once per status line in both branches. Measured on this host through the real fold at the shipped 256-line window, varying only how many keyed phases are simultaneously open: 9 keys -> 1.0 s, 32 -> 2.8 s, 64 -> 5.8 s, 128 -> 12.8 s, 256 -> 15.7 s (each figure includes ~1.0 s of bash startup plus sourcing fm-classify-lib.sh). The base code was 80.2 s at 9 keys and 80.8 s at 256, so this is strictly a 4.6x-44x improvement and introduces no regression - the intent's headline fix is real and the fork-per-line defect is gone. What the numbers add is the threshold: combined with the ~1.7 s the wrapped child script already spends on sourcing plus tail/awk/jq, the 2 s FM_SNAPSHOT_PARENT_ACTIVITY_TIMEOUT is still reachable at roughly 20-30 open phases, which is low enough to be hit by keyed writers likechild-outcome-<child>-<state>-<fp8>(bin/fm-inactive-reconcile.sh:337) orcaptain-hold-<task>-<n>(bin/fm-captain-hold.sh:229) on a busy parent channel that opens phases faster than it closes them - the same silentavailable:falsepath the intent describes. This is the already-fileddrop-quadratic-in-open-keys/residual-budget-headroompair you marked deliberately out of scope and filed separately, so no action is requested on this change; the threshold is just lower than an asymptotic note implies, which may matter when that separate item is prioritised. Note also that the new suite's two cases both use a 9-key log and assert forks, so neither this axis nor a future regression in_fm_decision_drop's per-call cost is pinned by it - a fork-count bound cannot see this cost, since it spends no processes at all.bin/fm-fleet-snapshot.sh:1558- At the shipped FM_SNAPSHOT_PARENT_ACTIVITY_TIMEOUT=2 this Windows/Cygwin host still returns available:false, reasons:["timeout"] after the fix, because the parent-activity child's fixed scaffolding costs ~3.0 s here with the fold contributing only ~0.24 s of it: three jq startups ~1.7 s, bash startup plus sourcing bin/fm-classify-lib.sh ~0.4 s, plus stat/tail/awk forks. This is the separately-filed residual budget headroom that the recorded decisions place out of scope, and it is not a defect introduced by this change - the change removes the super-linear growth term (69.9 s -> 3.1 s at 256 lines) and leaves a constant that fits 2 s comfortably on any host with cheap forks. Recorded so the residual item has measured attribution; no action requested here.bin/fm-test-run.sh:1077- bin/fm-test-run.sh --check-coverage exits 1 on this host at BOTH the base commit f1fc96e and the target b452807, emitting "comm: file 2 is not in sorted order". The guard's sets are built with LC_ALL=C sort but comm runs under the host's en_US locale, which disagrees with C collation on '-' and '.', so the local result is a host-locale artifact rather than a real coverage gap. This change cannot be its cause: it only adds a hint row, which strictly lowers the unhinted count. Noted because round 3 asked for a check-coverage confirmation that cannot be obtained locally on this host; CI owns the real verdict.bin/fm-fleet-snapshot.sh --jsondriven over a fixture fleet home (drive-parent-activity.sh); snapshot-fixed-timeout10.txt vs snapshot-base-timeout10.txtbin/fm-bearings-snapshot.shover the same fixture fleet: omitted[9] carrying "secondmate parent activity evidence unavailable for 1 record(s)" at base, omitted[8] without it after; bearings-base-256…FM_SNAPSHOT_PARENT_ACTIVITY_LINES=1024snapshot runs at a 20 s budget against both classifiers; raising-the-constant-is-not-the-fix.txtbash tests/fm-classify-activity-fold-cost.test.shagainst a base-classifier tree (not ok - wide fold ... it is forking per status line again, exit 1) and against the target (both cases ok); fold-c…bash tests/fm-classify-decision-key.test.sh- 20 cases green, covering both stated-key positions, malformed-vs-missing slugs, note-head key stripping and the incremental foldbash bin/fm-test-run.sh --list --changedwith bin/fm-classify-lib.sh modified; changed-file-selection.txt lists fm-classify-activity-fold-cost.test.sh and fm-classify-decision-key.test.sh alongside…bash tests/fm-classify-activity-fold-cost.test.shon the target (green, 4 runs, 10.3-19.5 s wall on this host)bash tests/fm-classify-activity-fold-cost.test.shagainst a tree with bin/fm-classify-lib.sh reverted to base f1fc96e (fails:not ok - wide fold ... it is forking per status line again)bash tests/fm-classify-decision-key.test.sh(20 cases green - the suite pinning the semantics of the rewritten _fm_decision_key / status_line_note / _fm_decision_drop)bin/fm-fleet-snapshot.sh --jsondriven over a fixture fleet home with 20 / 256 / 1024 routed parent-channel status lines, base-lib vs fixed-lib, at FM_SNAPSHOT_PARENT_ACTIVITY_TIMEOUT of 2 s, 10 s and 20 s (drive-parent-activity.sh)bin/fm-bearings-snapshot.shover the same fixture fleet at 256 routed status lines, base-lib vs fixed-lib, comparing the operator-visibleomittedsurfaces (drive-bearings-report.sh)Timing of bounded_parent_activities_json's own child script, extracted verbatim, at 20 / 120 / 256 lines against both classifiers (fold-cost-table.sh)Attribution of the post-fix residual: bash startup, sourcing bin/fm-classify-lib.sh, the 256-line fold, and the child's three jq startups, timed separatelyByte-level differential ofstatus_open_activities,status_open_decisionsandstatus_open_decisions_incremental, named-file and streaming forms, base vs fixed, over three crafted corpora (both stated-key positions, malformed and empty slugs, corr tags, mid-note key prose, closing verbs, blank lines, reopening, prefix-sharing keys phase1/phase10/phase100 and a/ab, the open set emptying then refilling, an empty note)bash bin/fm-test-run.sh --list --changed --base b452807with bin/fm-classify-lib.sh modified (selects both fm-classify-activity-fold-cost.test.sh and fm-classify-decision-key.test.sh)bash bin/fm-test-run.sh --check-coverageat both the base commit and the target (identical pre-existing exit 1 on this host)docs/fm-test-portable-shards.md:61- Judgment call left unresolved, not a doc defect. The provenance sentence records the fold-cost hint as "the 7423 ms local native-Windows measurement ... from 2026-09-18, the slowest of three green local runs ... pending a CI refresh". A fresh green run of tests/fm-classify-activity-fold-cost.test.sh on this same Windows host just now measured 12606 ms — about 70% above the recorded stopgap — because the suite's fork calibration loop scales with host load. The doc is still honest as written (line 10 warns local timings are load-sensitive and line 11 labels such hints as stopgaps), so I made no edit: correcting the number would mean changing portable_serial_weight_hints in bin/fm-test-run.sh, which is code and belongs to the review/testing phase, and under-weighting only costs shard balance, never coverage. Raising it so the author knows the stopgap sits at the optimistic end of its own local spread until the CI refresh replaces it.⏭️ **Lint** - skipped
✅ **Push** - passed
✅ No issues found.
Validation notes (stages, and what did and did not run)
The test stage ran, and passed
The pipeline's test stage completed -
status=completed, 63 minutes. It wasnot skipped, and nothing about it was waived. It drove
bin/fm-fleet-snapshot.sh --jsonover a fixture fleet whose secondmate carries a 256-line routedparent-channel log and confirmed the defect and its fix on the real product
surface: before, the snapshot publishes
available:false, reasons:["timeout"]with zero records; after,
available:truewith all nine phase records. Measuredin that same harness, the fold is flat in log length - base 7192 / 32290 / 69890
ms at 20 / 120 / 256 lines against 3193 / 2894 / 3120 ms fixed. It also checked
the intent's claim that a bigger constant is not a fix: with the budget raised
tenfold over a 1024-line window, the pre-fix read still times out while the
post-fix read publishes the whole window.
An earlier attempt at this stage was cut twice at a 30-minute agent cap on this
host. That cap was cutting live work rather than catching a wedge - the stage
needs about 63 minutes here - and it was raised in local operator configuration,
not in anything this repository ships.
The lint stage did not run at all
Lint was skipped, and skipped is what the record says. It is not a waiver and
the check was not unwanted.
The stage never executed. This repository pins
commands.lint: bin/fm-lint.shso the pipeline uses the same lint owner CI uses, but on this host the daemon
hands that command to
cmd.exerather than bash, so it dies in about a secondwith
'bin' is not recognized as an internal or external commandwithoutlinting anything. Run properly through bash on this branch,
bin/fm-lint.shexits 0. The local invocation is the defect; the script is sound, and the repo's
pinned configuration was deliberately left untouched rather than bent to suit one
machine.
Lint is still exercised before merge:
.github/workflows/ci.ymlrunsbin/fm-lint.shindependently on this pull request. So the distinction thatmatters to a reader is that this is a check which ran elsewhere, not a check that
was skipped past.
Branch history
The branch was rebased onto the merge of #7 and the gate branch ref was
force-pushed (lease-guarded against the previous head) to the rebased head.
Before that rebase was adopted, the change's fold output was verified
byte-identical to the pre-change base at the new rebase parent, across a corpus
covering malformed and empty key slugs, note-head keys, correlation tokens,
reserved namespaces, colonless prose, both folds, both entry points and every
incremental prefix. That verification is why rewriting the ref was safe rather
than merely convenient.
Incidental finding, for anyone who pushes to the gate
Pushing to the no-mistakes gate ref starts a pipeline run by itself. The run
spawned that way had
intent: skipped- its intent log readscanning recent agent transcripts... no matching agent transcript found- so it was validatingwith no intent at all and its review had no acceptance criteria. It was cancelled
and the authorized run restarted with an explicit
--intent. This is a trap foranyone who force-pushes and walks away: the run looks ordinary in the run list
and is only distinguishable by reading its intent-step log.