v1.3.0 - Antigravity 2.0 port (no longer Claude-Code-only)
Warm-resume + the handoff journal now run on Antigravity 2.0. CoalHearth's Claude-Code-only, closed-by-design premise is retired - AG shipped a real IDE hooks.json engine.
- bin/ag-pre-invocation.js (warm-resume rides the first PreInvocation; AG never fires SessionStart) + bin/ag-post-tool-use.js (journal step) over a shared lib/journal-step.js core.
- Both honor payload.cwd so the journal lands at the workspace.
- Fixed: a cross-session journal-contamination path caught pre-release.
- Tier = wired: built + hermetically tested vs the verified AG spec; live delivery pending.
Gate: verify PASS + 115/115 tests.