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ICW Specification — E6:S07:T115 last-modified stamp forensic integrity guardrails

Context​

Board workflows currently rewrite Last modified timestamps broadly during synchronization passes, even when no substantive work occurred on the linked task/FR/BR/UXR record. This destroys temporal-drift signal and forensic usefulness.

Goal​

Define enforceable semantics and guardrails so row-level Last modified stamps change only when substantive underlying work evidence exists.

In Scope​

  • Normative definition of substantive vs non_substantive updates.
  • UKW/RW board-mutation guardrails for stamp preservation.
  • Evidence-driven timestamp derivation from linked canonical records.
  • Validator/audit requirements for detecting synthetic mass stamp churn.
  • Regression scenarios for rewrite-only vs work-driven updates.

Out of Scope​

  • Retroactive rewrite of historical timestamps without evidence.
  • Broad board taxonomy or MoSCOW-priority policy redesign.
  • Unrelated workflow refactors outside timestamp integrity paths.

Acceptance Criteria​

  1. Policy explicitly states board rewrite alone must not mutate per-row Last modified.
  2. Update paths mutate stamps only when linked source evidence is substantive.
  3. Validation detects anomalous mass timestamp churn without source deltas.
  4. UKW/RW outputs include stamp-integrity audit counters for forensic review.
  5. Regression tests prove no-op rewrites keep timestamps stable.

Dependencies​