v0.7.0

Added

• check --only STATE (repeatable) filters human and JSON output by edge state; the exit code
  still reflects every edge (#19).
• graph --format json emits a machine-readable node and edge dump that matches the Mermaid and
  DOT edge collapsing (#21).
• impact --depth N bounds the reverse walk, and impact --json entries now carry a depth
  field (#22).
• reconcile --dry-run previews the plan without writing, and reconcile --json emits a
  machine-readable plan for both dry and real runs (#17).
• The Linear client retries transient HTTP 429 and 5xx failures with bounded backoff, honoring
  Retry-After up to a 30 second cap (#24).
• The version-sync guard now also checks README pinned install refs (game-lattice@vX.Y.Z)
  against __version__ (#34).
• The release job now publishes a GitHub Release for each tag it cuts, with the body taken from
  the matching ## [X.Y.Z] CHANGELOG section; scripts/extract_release_notes.py (pure core
  version_check.changelog_section) extracts it and fails the release if that section is missing
  or empty (#47).

Changed

• graph --format now rejects unknown formats with exit 2 instead of silently rendering
  Mermaid (#21).
• Ancestor recording in the loader is a single stack pass instead of a quadratic scan (#26).
• CI runs the code-quality job on both Python 3.13 and 3.14 (#33).

Removed

• Unused datetime_utils helpers (local_now, parse_iso, format_iso); utc_now remains the
  single sanctioned current-time entry point (#35).