Lucent-Financial-Group · AceHack · May 11, 2026 · May 11, 2026 · May 11, 2026
diff --git a/docs/BACKLOG.md b/docs/BACKLOG.md
@@ -321,9 +321,13 @@ are closed (status: closed in frontmatter)._
 - [ ] **[B-0088.5](backlog/P2/B-0088.5-audit-backlog-index-integrity-lint-advisory-status-riven-2026-05-11.md)** Audit backlog-index-integrity.yml for advisory-vs-required parity (B-0088 sibling)
 - [ ] **[B-0089](backlog/P2/B-0089-veridicality-rainbow-table-canonicalization-research-and-graduation-aaron-ani-amara-2026-04-28.md)** Veridicality rainbow-table canonicalization — research + ship semantic + scoring layers; drop "bullshit detector" as a forward-going name
 - [ ] **[B-0090](backlog/P2/B-0090-cadenced-lost-substrate-recovery-audit-aaron-2026-04-28.md)** Cadenced lost-substrate recovery audit (worktrees + orphan branches + closed-not-merged PRs + draft PRs aged > N days)
+- [ ] **[B-0090.1](backlog/P2/B-0090.1-lost-substrate-3-bucket-classification-taxonomy.md)** Lost-substrate 3-bucket classification taxonomy (ALREADY-COVERED / NEEDS-RECOVERY / OBSOLETE)
 - [ ] **[B-0090.1](backlog/P2/B-0090.1-ts-worktree-survey-atomic-riven-2026-05-10.md)** TS survey tool for locked worktrees (git worktree list + 3-bucket classify)
 - [ ] **[B-0090.2](backlog/P2/B-0090.2-ts-orphan-branch-survey-atomic-riven-2026-05-10.md)** TS survey tool for orphan branches (unmerged + no-PR)
+- [ ] **[B-0090.2](backlog/P2/B-0090.2-worktree-branch-delta-audit.md)** Worktree-branch delta audit (locked .claude/worktrees/ only, last-N-days)
+- [ ] **[B-0090.3](backlog/P2/B-0090.3-closed-not-merged-pr-scan.md)** Closed-not-merged PRs + orphan branches + aged-draft-PRs scan (AceHack + LFG)
 - [ ] **[B-0090.3](backlog/P2/B-0090.3-ts-closed-pr-survey-atomic-riven-2026-05-10.md)** TS survey for closed-not-merged PRs aged + content diff
+- [ ] **[B-0090.4](backlog/P2/B-0090.4-cadence-and-hygiene-history-hook.md)** Cadence hook + hygiene-history append for lost-substrate audits (weekly/monthly)
 - [ ] **[B-0090.4](backlog/P2/B-0090.4-ts-draft-pr-aged-survey-atomic-riven-2026-05-10.md)** TS survey for draft PRs aged > N days + content snapshot
 - [x] **[B-0091](backlog/P2/B-0091-audit-and-rename-servicetitan-references-in-live-docs-aaron-2026-04-28.md)** Audit + rename ServiceTitan references in live (non-historical) repo surfaces — use generic "external UI demo" / "external CRM API demo" forward-going
 - [ ] **[B-0092](backlog/P2/B-0092-public-company-contributor-compliance-doc-and-cadenced-trajectories-aaron-2026-04-28.md)** Public-company contributor compliance — doc + cadenced trajectories (audit-on-commit, weekly/monthly compliance review, on-PR audit, on-onboarding briefing, drift retrospective)

diff --git a/docs/backlog/P2/B-0090-cadenced-lost-substrate-recovery-audit-aaron-2026-04-28.md b/docs/backlog/P2/B-0090-cadenced-lost-substrate-recovery-audit-aaron-2026-04-28.md
@@ -1,17 +1,21 @@
 ---
 id: B-0090
 priority: P2
-status: open
+status: decomposed
 title: Cadenced lost-substrate recovery audit (worktrees + orphan branches + closed-not-merged PRs + draft PRs aged > N days)
 tier: factory-hygiene
-effort: M
+effort: M (now 4x S children)
 ask: maintainer Aaron 2026-04-28T23ish *"probably a trajectory this is recovery work we should do forever on a cadence these kind of lost things could always build up"*
 created: 2026-04-28
-last_updated: 2026-05-02
+last_updated: 2026-05-11
 depends_on: []
 composes_with:
   - B-0060
-tags: [aaron-2026-04-28, factory-hygiene, lost-substrate, cadenced-audit, content-loss-surface, metric-ladder]
+  - B-0090.1
+  - B-0090.2
+  - B-0090.3
+  - B-0090.4
+tags: [aaron-2026-04-28, factory-hygiene, lost-substrate, cadenced-audit, content-loss-surface, metric-ladder, decomposed]
 type: friction-reducer
 ---
 
@@ -26,6 +30,21 @@ worktrees + the in-flight 19 LOST GitHub branches task (#264):
 > forever on a cadence these kind of lost things could always
 > build up."*
 
+## 2026-05-11 Re-decomposition (Riven, one bounded step)
+
+B-0090 was too broad (M effort, trajectory-shaped, 4 surfaces + cadence + metric ladder). Per "always re-decompose during build — assume mistakes" rule, split into 4 smallest dependency-ordered atomic S-effort child rows:
+
+**Dependency order (buildable now):**
+
+1. **B-0090.1** — 3-bucket taxonomy (root, no deps) — defines ALREADY-COVERED / NEEDS-RECOVERY / OBSOLETE with decision tree.
+2. **B-0090.2** — worktree delta audit (depends 0090.1) — TS scanner for locked worktrees only.
+3. **B-0090.3** — closed-not-merged / orphan / aged-draft PR scan (depends 0090.1) — GitHub surface.
+4. **B-0090.4** — cadence hook + hygiene-history append (depends 0090.1+2+3) — wiring only.
+
+Re-decomp assumption checked: taxonomy split first avoids label drift; scanners are pure classification (no recovery logic); cadence is hook, not full scheduler. All children are now claimable as single bounded slices. Parent effort reduced to "orchestration of children".
+
+Focused checks run in worktree (see PR body).
+
 ## Why P2
 
 Lost substrate accumulates as a side effect of velocity. Without

diff --git a/docs/backlog/P2/B-0090.1-lost-substrate-3-bucket-classification-taxonomy.md b/docs/backlog/P2/B-0090.1-lost-substrate-3-bucket-classification-taxonomy.md
@@ -0,0 +1,43 @@
+---
+id: B-0090.1
+priority: P2
+status: open
+title: Lost-substrate 3-bucket classification taxonomy (ALREADY-COVERED / NEEDS-RECOVERY / OBSOLETE)
+tier: factory-hygiene
+effort: S
+depends_on: []
+composes_with: [B-0090]
+tags: [b0090-decomp, taxonomy, classification, lost-substrate]
+type: friction-reducer
+---
+
+# B-0090.1 — Lost-substrate 3-bucket classification taxonomy
+
+## Why this child exists
+
+B-0090's Step 3 classification is the load-bearing primitive. Without a single, versioned, citable definition of the three buckets, every cycle reinvents the labels and drift appears. This row makes the taxonomy durable substrate before any scanner or cadence is built.
+
+## Atomic scope (S effort)
+
+- Single source of truth (new file or section in GLOSSARY.md or docs/DRIFT-TAXONOMY.md extension).
+- Exact bucket names + one-sentence operational definition + decision tree (1-2 if/else per bucket).
+- Example from 2026-04-28 audit for each bucket.
+- No tooling, no cadence, no scanners.
+
+## Dependency note
+
+This is the first root. All other B-0090.* children depend on it for the shared vocabulary. Re-decomposition assumption: taxonomy may need a 4th bucket later (e.g. PARTIALLY-COVERED); keep it three for v1.
+
+## Acceptance
+
+- [ ] Taxonomy committed as durable file with §33 header.
+- [ ] Decision tree fits on <20 lines.
+- [ ] One concrete example per bucket from prior audit.
+- [ ] No implementation beyond the definition.
+
+## Evidence
+
+- Parent: docs/backlog/P2/B-0090-cadenced-lost-substrate-recovery-audit-aaron-2026-04-28.md
+- Worked example memory: memory/feedback_lost_substrate_recovery_cadenced_trajectory_aaron_2026_04_28.md
+
+Co-Authored-By: Grok <noreply@x.ai>
diff --git a/docs/backlog/P2/B-0090.2-worktree-branch-delta-audit.md b/docs/backlog/P2/B-0090.2-worktree-branch-delta-audit.md
@@ -0,0 +1,46 @@
+---
+id: B-0090.2
+priority: P2
+status: open
+title: Worktree-branch delta audit (locked .claude/worktrees/ only, last-N-days)
+tier: factory-hygiene
+effort: S
+depends_on: [B-0090.1]
+composes_with: [B-0090]
+tags: [b0090-decomp, worktree, delta-scan, lost-substrate]
+type: friction-reducer
+---
+
+# B-0090.2 — Worktree-branch delta audit
+
+## Why this child exists
+
+The 57 locked worktrees are the highest-volume surface. B-0090.1 taxonomy now exists; this row is the minimal delta scanner that classifies only worktrees changed since last audit (not full 57 every time). Keeps cost S per cycle.
+
+## Atomic scope (S effort)
+
+- TS script (tools/hygiene/audit-worktree-delta.ts) or equivalent that:
+  - Lists locked worktree branches.
+  - Diffs against last-audit marker (file or git note).
+  - Applies B-0090.1 3-bucket classification.
+  - Outputs markdown table + count of NEEDS-RECOVERY.
+- No auto-prune, no recovery PRs, no cadence wiring.
+- Focused check: run on current .claude/worktrees/ and report bucket counts (include in PR body of this decomp).
+
+## Dependency note
+
+Depends on B-0090.1 for bucket names. Re-decomp assumption: "delta" may be over-constrained if no marker exists yet; first cycle may be full scan (still S).
+
+## Acceptance
+
+- [ ] Script passes dotnet build gate + focused lint.
+- [ ] Output exactly matches 3-bucket taxonomy.
+- [ ] No writes to root checkout (worktree only).
+- [ ] One-page runbook in the script header.
+
+## Evidence
+
+- Parent B-0090
+- B-0090.1 taxonomy
+
+Co-Authored-By: Grok <noreply@x.ai>
diff --git a/docs/backlog/P2/B-0090.3-closed-not-merged-pr-scan.md b/docs/backlog/P2/B-0090.3-closed-not-merged-pr-scan.md
@@ -0,0 +1,44 @@
+---
+id: B-0090.3
+priority: P2
+status: open
+title: Closed-not-merged PRs + orphan branches + aged-draft-PRs scan (AceHack + LFG)
+tier: factory-hygiene
+effort: S
+depends_on: [B-0090.1]
+composes_with: [B-0090]
+tags: [b0090-decomp, pr-state, orphan, draft-pr, lost-substrate]
+type: friction-reducer
+---
+
+# B-0090.3 — Closed-not-merged PRs + orphan + aged-draft scan
+
+## Why this child exists
+
+Task #264 tracked 14 closed-not-merged + 5 orphans. B-0090.1 taxonomy now defined; this is the GitHub-surface scanner that produces the same 3-bucket output for PRs and branches. Monthly cadence surface.
+
+## Atomic scope (S effort)
+
+- TS wrapper around gh api + git ls-remote (or existing substrate-discovery tool).
+- Filters: closed-not-merged (any age), orphan (no remote tracking), draft PRs >14 days.
+- Classify each with B-0090.1 buckets.
+- Emit hygiene-history row + summary counts only.
+- No auto-close, no recovery.
+
+## Dependency note
+
+Depends on taxonomy. Re-decomp assumption: "aged > N days" N=14 may be wrong; make N configurable in the row (default 14) so future cycles can tune without re-decomp.
+
+## Acceptance
+
+- [ ] Uses only existing gh + git surfaces (no new auth).
+- [ ] Output table matches taxonomy.
+- [ ] Focused check run: current counts of each category on LFG (include in decomp PR body).
+- [ ] SLOC < 150.
+
+## Evidence
+
+- Parent B-0090 + task #264
+- B-0090.1
+
+Co-Authored-By: Grok <noreply@x.ai>
diff --git a/docs/backlog/P2/B-0090.4-cadence-and-hygiene-history-hook.md b/docs/backlog/P2/B-0090.4-cadence-and-hygiene-history-hook.md
@@ -0,0 +1,42 @@
+---
+id: B-0090.4
+priority: P2
+status: open
+title: Cadence hook + hygiene-history append for lost-substrate audits (weekly/monthly)
+tier: factory-hygiene
+effort: S
+depends_on: [B-0090.1, B-0090.2, B-0090.3]
+composes_with: [B-0090]
+tags: [b0090-decomp, cadence, hygiene-history, autonomous]
+type: friction-reducer
+---
+
+# B-0090.4 — Cadence hook + hygiene-history append
+
+## Why this child exists
+
+B-0090 acceptance requires "cadence encoded as routine". With scanners (0090.2/3) and taxonomy (0090.1) defined, this is the minimal wiring that makes the audit fire on schedule and record each cycle in docs/hygiene-history/ without expanding AUTONOMOUS-LOOP core.
+
+## Atomic scope (S effort)
+
+- Add entry to existing cadence surface (docs/AUTONOMOUS-LOOP.md or hygiene tick) that invokes the two scanners.
+- Append one row per cycle to hygiene-history (timestamp + bucket counts + link to claim).
+- No new cron, no runner change, no full implementation of recovery.
+
+## Dependency note
+
+Depends on 0090.1 + scanners. Re-decomp assumption: "weekly vs monthly" split may be premature; start with single "cadenced" hook and let first three cycles calibrate the split. Smallest atomic = the hook + history append only.
+
+## Acceptance
+
+- [ ] One new row in hygiene-history format.
+- [ ] Hook is read-only invocation (no mutation in root).
+- [ ] Documents the N-day tuning point for future.
+- [ ] Passes build gate (doc-only change).
+
+## Evidence
+
+- Parent B-0090
+- B-0090.1, .2, .3
+
+Co-Authored-By: Grok <noreply@x.ai>