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m12-pr03: reconcile Stage A trailing items table#21

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m12-pr03: reconcile Stage A trailing items table#21
BalaShankar9 wants to merge 1 commit into
m12-pr02-coverage-gate-ai-enginefrom
m12-pr03-trailing-items-reconcile

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Doc-only.

Stacks on top of m12-pr02; retarget to main after the stack merges.

Updates docs/architecture/IMPLEMENTATION_MILESTONES.md "Stage A trailing items" table to reflect reality: TD-3, TD-4, and the feature-flag sunset enforcement governance item shipped during M11 (m11-pr40, m11-pr41, m11-pr42) but the trailing table was not updated at the time.

After this PR + m12-pr01 + m12-pr02 merge, the "Stage A trailing items" table has no un-started work. Stage B placeholders (MS-B1…MS-B5) untouched — they activate on scaling triggers, not now.

Doc-only. Updates docs/architecture/IMPLEMENTATION_MILESTONES.md
"Stage A trailing items" table to reflect reality: TD-3, TD-4
and the feature-flag sunset enforcement governance item shipped
during M11 (m11-pr40, m11-pr41, m11-pr42) but the trailing
table was not updated at the time. Adds explicit SHIPPED
markers + PR pointers to each row, and a closing line stating
the trailing list is fully closed.

Combined with m12-pr01 (TD-1) and m12-pr02 (TD-2), the
"Stage A trailing items (M11+, no PR numbers yet)" table is
now empty of un-started work. Stage B placeholders untouched.

No code, schema, or CI changes.
Copilot AI review requested due to automatic review settings May 8, 2026 22:48

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Pull request overview

Updates the architecture milestone documentation to reconcile the “Stage A trailing items” table with work that already shipped in M11, ensuring the document reflects current status and leaves only Stage B placeholders for future trigger-based work.

Changes:

  • Marks TD-3 (/metrics prometheus_client migration), TD-4 (Sentry redaction depth), and feature-flag sunset enforcement governance item as shipped (with PR references).
  • Adds a note indicating Stage A trailing items are fully shipped and Stage B placeholders remain trigger-based.

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| Feature flag sunset enforcement (CI fail past sunset) | (governance) | After `config/feature_flags.yaml` exists with ≥5 flags — **SHIPPED m11-pr42** (`scripts/governance/check_feature_flags.py` fails CI past `sunset_date` unless explicit `--allow-expired-baseline`) |
| Staging mirror of prod data shape | P1-15 | After M10 — **SHIPPED m11-pr45** |

**Stage A trailing items — all SHIPPED.** No outstanding M11+ work without a milestone home. Stage B placeholders below activate only on trigger.
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