Spawns the gsd-code-reviewer agent to analyze code at the specified depth level. Produces REVIEW.md artifact in the phase directory with severity-classified findings.

Arguments:

Phase number (required) — which phase's changes to review (e.g., "2" or "02")
--depth=quick|standard|deep (optional) — review depth level, overrides workflow.code_review_depth config
- quick: Pattern-matching only (~2 min)
- standard: Per-file analysis with language-specific checks (~5-15 min, default)
- deep: Cross-file analysis including import graphs and call chains (~15-30 min)
--files file1,file2,... (optional) — explicit comma-separated file list, skips SUMMARY/git scoping (highest precedence for scoping)
--fix (optional) — after review completes (or if REVIEW.md already exists), auto-apply fixes found. Spawns gsd-code-fixer agent. Accepts sub-flags:
- --all — include Info findings in fix scope (default: Critical + Warning only)
- --auto — enable fix + re-review iteration loop, capped at 3 iterations

Output: {padded_phase}-REVIEW.md in phase directory + inline summary of findings