inspect: rename the command and terminology to "review"

The command was inspect (aliased review) with worker agents called "inspectors". It is still hidden during maturation, so there is no back-compat burden — collapse the two names into one.

• command Use is now review; drop the inspect name and alias
• rename the worker-role term "inspector(s)" → "reviewer(s)" throughout (help text, identifiers like defaultReviewerTimeout/reviewerCount, comments, the labs registration, and docs); the judge stays "the judge"
• rewrite the inspectTimeout flag var as reviewTimeout
• update user-facing strings (entire inspect … → entire review …), the labs experimental-command entry, and root.go wiring comment
• update docs/architecture/review-command.md and rename the handoff doc to review-judges-handoff.md

Generic "inspect" verbs (drilling into agent output, examining JSON/refs, the skilldiscovery match keyword, ast.Inspect) are intentionally left.