v2.9.27 — Audit closeout + crossval expansion

Final addressable-scope release before v3.0. Closes 13 specific audit findings by direct file:line cross-reference, including all three longest-standing deferred paired-fix items.

Headline metric

Crossval JS↔Python bit-identical surface went from 444 → 747 checks across 43 fixtures, via backporting tf_working_days, ff, and ff_working_days to Python (F24 documented JS-only gap LIFTED).

Paired JS+Python fixes (the three deferred items)

• R6 Completed-successor skip in backward pass (SCL Protocol §4 / AACE 29R-03 §4 retained-logic)
• R12 data_date floor snaps forward to next workday on non-workday calendars
• R21 Python add_work_days MonFri fast path (×ばつ speedup at 30d walks)

Python parity backports

• R9 tf_working_days + _count_work_days_between helper
• F24 ff + ff_working_days (full FF loop, FF/SF-binding-succ calendar correction)
• A12-M1/M2/M4 topology hash hardenings: str() coercion, input_relationship_count vs hashed_relationship_count, algorithm: null for empty

Engine MED/HIGH

• R10 Python _cal_for honors project_calendar fallback (was JS-only)
• R6 MS_Start/SO constraint-widens-lf WARN (paired with existing MS_Finish/MFO WARN)
• R18 5 method_ids gained AACE-canonical methodology labels (computeScheduleHealth, computeBayesianUpdate, computeKinematicDelay, computeTopologyHash, computeFloatBurndown)

Disclosure / docs / test

• R16 DAUBERT/CONTRIBUTING crossval counts refreshed to 1071/747/43
• R14 Array.isArray() topology-hash gate + coverage-gap caveat
• R8 T3.18 in-progress test extended with TF/LF/CP assertions
• R7 docs/api.md activity-code contract documented

Test state

Audit ledger status

This release closes every patchable engineering item from the 20-agent audit ledger. Remaining items are all v3.0 architectural scope:

1. Section D full calendar-awareness (fold Section C into runCPM)
2. Welford's online variance for Bayesian
3. Lognormal/Beta exact-quantile inverse-CDF CIs
4. Sub-day lag precision (engine-wide ripple)
5. Python TT_Hammock + TT_LOE implementation
6. Engine epoch move (fixes R12 epoch collision)
7. Hammock-of-hammocks LS_CEIL walker class

The v2.9.x audit-driven engineering wave is complete. v3.0 will be a design-and-implement cycle, not a patch wave.

v2.9.26 — Provenance sidecars + citation polish

3 audit items closed.

Provenance

• R20 LOW — npm run attest writes cpm-engine.js.sha256 and python_reference/cpm.py.sha256 sidecar files for mechanical shasum -c verification

Bayesian citations

• R22 LOW — Elshaer (2013) full citation; paraphrased "38%" percentage removed
• R22 LOW — Bayesian + kinematic Python parity gap explicitly disclosed in DAUBERT.md

Test state

Audit ledger

~98 cumulative closed. ~12 still open (Python F4/F6 backports, hammock-of-hammocks LS walker, MCP-side, 7 v3.0 architectural).

v2.9.25 — Perf wave + Python parity partial

Engine perf (3)

• R21 OoS detector memoizes actual_start offsets (~500k fewer Date constructions on 25k-activity schedules)
• R21 _isCleanMonFri uses bitmask not Set alloc (~200k fewer throw-away Sets per CPM run)
• R21 Section D constraint helpers hoist projectStart parse (~300k fewer redundant Date constructions)

Python parity (1 partial)

• R21 Python add_work_days caches holiday Set on calendar_info (avoids 73M list-to-set ops on 50k×ばつ365-holiday schedules). MonFri fast-path reverted — broke 444/444 → 440/444; paired-fix candidate documented.

Daubert doc (1)

• R8 DAUBERT.md notes progress_override schedule mode is unsupported (retained-logic only, already alerted; now also in public disclosure docs).

Test state

Audit ledger

~95 cumulative closed v2.9.13–v2.9.25. ~15-20 still open (Python F4/F6 backports, hammock FS hard-precedence, MCP-side). ~7 deferred to v3.0.