review-loop

# Review Loop A source-agnostic, convergence-paced review-resolve loop for code/PR diffs: it drives a pluggable review source to convergence (verdict=approve), auto-applying mechanical fixes and gating the judgment calls. ## Caller Signature ``` /review-loop [source?] [scope?] source : { codex | code-review } -- optional; review source behind the (diff, design-intent) → { findings[], verdict } interface -- absent → Phase 0 asks which source to use (no default; one invokable source relays, zero stops) scope : PR number | (implicit) -- optional; PR number, or implicit current-PR / working-tree detection ``` The review source is pluggable: any source satisfying the `(diff, design-intent) → { findings[], verdict }` interface can drive the loop. `codex` and `code-review` are the two sources documented in the Source Interface section; both are runtime-selected, not fixed at definition time. When `source` is omitted, Phase 0 asks which source to use (no preselected default; with exactly one invokable source it relays the designation, with none it stops). When `scope` is omitted, Phase 0 detects it (current-branch PR or working tree). ## Pipeline Overview ``` /review-loop [source?] [scope?] Phase 0 : source designation (arg → relay | absent → ask, cardinality-guarded) + scope detect (PR diff | working tree) + design-intent harvest (rules/comments for th...