fix(review): stale worker config excludes that worker, not the crew (trail findings)

Trail findings on this branch:

• Removing codex's curated /review orphaned configs the old picker auto-preselected, and in the multi-agent path one worker's failed skill validation returned a SilentError that aborted the ENTIRE review — claude-code and all — until the user reconfigured codex. Validation failure now excludes just that worker with a loud 'skipping reviewer <name>: ...' warning and the rest of the crew runs; the run still hard-fails when every worker is excluded, so a fully-stale profile can't silently review with nobody.

• The codex install hint's suppression fingerprint was slash-form (/codex:adversarial-review) while codex discovery emits $-form invocations; the exact-match comparison could never intersect, so the 'install codex-review-pack' hint showed forever even with the plugin installed. Fingerprint updated to $-form.