#1347 Track stdin note updates, extension settings audit, and Bun merge drift

Summary

Record three newly reported defects in the PM system of record with reproduction context, expected and observed behavior, all-status duplicate checks, and typed relationships to the delivered features. These issues were opened after PR #1344 merged.

• pm-2589e6 tracks GitHub #1343: full-item stdin JSON note edits silently succeed without a change.
• pm-wtqltn tracks GitHub #1345: extensions lack an audited host-bound settings mutation.
• pm-vks66s tracks GitHub #1346: Bun-installed merge drivers fail strict health drift checks.

Verification

• pnpm build
• pm validate --check-history-drift: 2,839 items checked, no drift
• pnpm changelog:pm:check: unchanged; these issues are open
• pm list --status in_progress: zero

Summary by Sourcery

Chores:

• Record three newly reported defects in the PM system of record, including reproduction context, expected and observed behavior, duplicate checks, and typed relationships.

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Summary by cubic

Records three newly reported defects as PM issues after PR #1344 merged, covering GitHub #1343, #1345, and #1346.

• pm-2589e6 tracks GitHub #1343: full-item stdin JSON updates silently succeed without changing edited notes.
• pm-wtqltn tracks GitHub #1345: extension settings updates bypass the workspace audit chain and cause history drift.
• pm-vks66s tracks GitHub #1346: Bun-installed merge drivers are reported drifted by strict health immediately after install.
• Each issue includes reproduction steps, expected versus observed behavior, all-status duplicate checks, and parent relationships to the delivered features.
• Planning metadata (acceptance criteria, risk, confidence, estimates) is filled in so active-item quality gates stay strict while the issues remain open.

No product code changes; the issues remain open.