refactor(reconcile): consume the shared runner from chant 0.11.0 (#20) (#54)

Replace warden's vendored runReconcile/Cycle with the generic harness now
in @intentius/chant/reconcile. runner.ts (443 → ~90 lines) is a thin
adapter that wires warden's GitHub diff (nowMs-defaulted) + member-aware
guardrails + config.orgs into the shared loop, and re-exports the harness
types so the in-repo surface is unchanged. Bump chant deps to ^0.11.0.

This completes github-warden#20: the full provider-agnostic core (change
set, diffCollection, guardrails, AND the runner) lives in chant — a
gitlab/forgejo warden builds on it instead of vendoring.

469 tests green; action bundle rebuilt.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: lex00