chore(release): v0.29.0 — offset detector + false_trigger_reason (first prod-bound build since 0.27.0)

Bumps TOOL_VERSION 0.28.0 -> 0.29.0 and pyproject/CLAUDE/README 0.27.0 -> 0.29.0,
and dates the CHANGELOG section. v0.28.0 (offset DC-baseline detector) was
version-bumped in-tree but never tagged or deployed, so 0.29.0 is the first build
to carry both it and the false_trigger_reason column to prod.

Pairs with Terra-View >= 0.24.0. false_trigger_reason auto-migrates on startup;
the offset detector needs the shape backfill (scripts/backfill_event_shape.py) on
the prod store to populate shape_offset* on existing rows.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDXjZCr4RqT2U3QvMDhgzf

minimateplus/event_file_io.py

@@ -50,7 +50,7 @@ SIDECAR_KIND   = "sfm.event"
 # bumped without a `pip install` re-run — leading to confusing stale
 # version stamps in sidecars.  Bump this constant and CHANGELOG.md
 # together at release time.
-TOOL_VERSION = "0.28.0"
+TOOL_VERSION = "0.29.0"
 
 try:
     # Best-effort: prefer the installed metadata when it's NEWER than the