v0.27.0

[0.27.0] - 2026-08-28

Fixed

• Antigravity script-backed hooks resolved with $PWD plugin-root fallback
  (#220). Antigravity CLI does not export AGY_PLUGIN_ROOT to hook commands,
  but runs hooks with the working directory ($PWD) set to the directory containing
  hooks.json (the plugin root). Compiled hook commands now use ${plugin_root_env:-$PWD}
  and ${project_dir_env:-${OLDPWD:-$PWD}} so all script-backed hooks (outdated-check,
  invariants-card, token-guard, outdated-recheck, token-telemetry) resolve
  and execute rather than silently taking the missing-script fallback.
• Hook missing-script diagnostic deduplication across harnesses without session_id
  (#221). The _report_once_fragment deduplication marker extracted only
  session_id from stdin JSON. On harnesses providing conversationId (such as
  Antigravity) and no session_id, the key defaulted to nosession, permanently
  suppressing missing-script errors across all future sessions after the first occurrence.
  The diagnostic now parses both session_id and conversationId, falling back to
  ANTIGRAVITY_CONVERSATION_ID and $PPID (parent CLI process PID), preserving anti-nag
  per session while staying observable across new sessions.
• Regression tests for cross-harness hook execution and fallback resolution (#220, #221).
  test_hooks_parity.py now asserts that all hook script commands resolve when
  harness-specific environment variables are unset, and tests session/conversation ID extraction.