release: Open Pstack 1.2.0

[ericlitman]

Summary

• bump Open Pstack from 1.1.0 to 1.2.0 after merging Sync Cursor pstack 0.14.3 verified multi-PR checklist #17, Adopt Bun bootstrap guard and pointer-only platform mapping #18, and Apply Bugbot triage to the standalone Babysit skill #20
• update the public version references and both plugin manifests
• add a plain-language changelog entry produced with pstack:bro

Verification

• full test suite: 155 tests, 635 assertions
• TypeScript checking
• Node syntax checks
• Claude and Codex manifest validation
• marketplace validation
• static version and release invariant checks
• no current 1.1.0 references outside historical changelog entries

Installed-host proof

• every tracked plugin file byte-matches both installed 1.2.0 caches
• installed Claude and Codex checkers each accept the corresponding saved three-PR plan
• installed Claude and Codex startup paths each emit the intended early diagnostic under Node
• fresh Claude and Codex sessions each resolve and invoke installed pstack:bro
• neither live canary invokes pstack:how or changes the release worktree

Final review gate

• exact-head source verifier: CLEAN
• exact-head executable-gates verifier: CLEAN
• exact-head installed-host verifier: CLEAN
• independent four-ledger audit: CLEAN, no unresolved Attention

Release contents

• Sync Cursor pstack 0.14.3 verified multi-PR checklist #17: verified multi-PR implementation plans
• Adopt Bun bootstrap guard and pointer-only platform mapping #18: explicit Node runtime diagnostics for Bun-only entry points
• Apply Bugbot triage to the standalone Babysit skill #20: one shared Bugbot triage rubric for both Babysit paths