docs(commits): check disk before declaring /review-code unavailable

Step 1 told the agent to run /review-code but didn't say what to do when the skill exists on disk yet isn't in the session's available-skills list. The list covers plugin-installed skills only. User commands under ~/.claude/commands/ are routable as slash-commands but don't appear in it, so the agent could declare /review-code unavailable and fall through to the trivial-one-liner exception in Step 2.

The new Discovery check tells the agent to verify both ~/.claude/commands/review-code.md and ./.claude/commands/review-code.md on disk before declaring the skill unavailable, and surface the mismatch rather than auto-skipping.

Also drops three absorbed or stale inbox files: the skill-discovery handoff (signal absorbed by this edit), the missing-inbox-dir handoff (already resolved by 470085f), and a stale date-coverage scan output (deferred until the task-review habit lands).

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