v1.2.1

Summary

• Switch cc to Codex native plugin_hooks with bundled hooks/hooks.json from the active plugin cache.
• Remove the supported local checkout/stable-root install flow; installer now uses marketplace/add + plugin/install and cleans legacy global hooks.
• Make native hook feature gates and trust this plugin's current native hook hashes via hooks/list + config/batchWrite.
• Update README, skills, tests, and changelog for the marketplace/cache-only 1.2.1 flow.

Verification

• npm run lint
• npm run typecheck
• npm run check:version-sync
• npm run check:changelog
• npm run test
• tests/integration/claude-companion.test.mjs
• npm run test:e2e
• npm pack --dry-run
• real sendbird-local-121 cache install setup --json returned ready with hookTrust.ready=true