Update CC built-in command list: add 'claude project purge' (v2.1.126)

[itsdestin]

Surfaced by /release v1.2.2 → next review (review-cc-changes agent).

CC v2.1.126 CHANGELOG:

Added `claude project purge [path]` to delete all Claude Code state for a project (transcripts, tasks, file history, config entry) — supports `--dry-run`, `-y/--yes`, `-i/--interactive`, and `--all`.

YouCoded ships hand-maintained CC built-in command lists in two places:

• `desktop/src/main/cc-builtin-commands.ts`
• `app/src/main/kotlin/com/youcoded/app/runtime/CommandProvider.kt` (`CC_BUILTIN_COMMANDS` block)

Both have version-anchor comments that should also be bumped to v2.1.126.

What to do

1. Decide whether `project purge` should appear in the CommandDrawer search at all — it's destructive enough that intentional exclusion (with a comment) is reasonable.
2. If including: add the command (and its subcommands) to both files.
3. Bump the version-anchor comment in both files to v2.1.126.

Related

• See `youcoded/docs/cc-dependencies.md` "CC built-in command list" touchpoint for the contract.