Preview and apply a plugin

Dry-run a catalog plugin against a project, then apply it and confirm the result.

Tape: ../tapes/07-preview-apply-plugin.tape (CLI repo tape)

Commands

1. ht init --main codex --aliases claude-code,cursor — initialise HarnessTap and set harness preferences
2. ht plugin list --search foundation --remote-only — browse catalog plugins
3. ht apply engineering-foundation --dry-run — preview planned writes
4. ht apply engineering-foundation — materialize the plugin into the project
5. ht status . — confirm the final state