chore(deps): chant 0.56 -> 0.71.1 (#59)

Fifteen minor versions. Typecheck, all 553 tests, the CLI bundle and the
action bundle are clean on the new pin.

The jump needed a chant fix first. chant 0.71.0's core imports `js-yaml` by
name without declaring it (INTENTIUS/chant#2433); inside chant's own workspace
it resolved via hoisting, but here it did not, and the production esbuild
bundle failed:

    node_modules/@intentius/chant/src/op/activities/apply.ts:227:35:
      ERROR: Could not resolve "js-yaml"

chant 0.71.1 declares it, so it now arrives transitively and the bundle
resolves. Pinning ^0.71.1 rather than ^0.71.0 is deliberate: 0.71.0 cannot
build here.

`action/index.mjs` is rebuilt because the bundle embeds package.json and the
chant code it links.


Claude-Session: https://claude.ai/code/session_0146g8Ahc75AXVSWGBt7ggmJ

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: lex00