I now have everything needed. Let me summarize my findings across the phases.

**Phase 1–2 (re-anchor + explore):** Completed task `.1` built the cursor review-backend foundation in `plugins/flow-next/scripts/flowctl.py` (evidence commit `dcbb1a7e`). I read the actual registry entry (L3527), `run_cursor_exec` (L4126), and `cmd_cursor_check` (L19035).

**Phase 3 (drift):** Implementation matches the spec's described contract on every load-bearing name/API/shape:

| Aspect | Spec said | Actually built |
|--------|-----------|----------------|
| Registry | models set, `efforts: None`, `default_model gpt-5.5-high` | Exactly that (L3527) |
| `run_cursor_exec` sig | `(prompt, session_id=None, *, spec, repo_root) -> tuple[str,str,int,str]` | Exactly that (L4126) |
| Invocation | `cursor-agent -p --output-format json --trust --mode ask --model <m> [--resume <id>]`, `cwd=repo_root`, no `--effort`, timeout 600 | Exactly that |
| Resume-only / oversize | first call omits `--resume`; oversize → explicit raise | resume-only; `ValueError` prompt-too-large (L4166) |
| `cursor check` | `{available, version, authed}` copilot-aligned | superset `{available, version, authed, model_used, error}` — copilot's own schema; not drift |

Helper names (`require_cursor`/`get_cursor_version`/`run_cursor_exec`) all as specced. Downstream `.2` depends on `run_cursor_exec` by exactly this signature — no stale reference.

**Phase 3b:** Husk short-circuit N/A (glossary 38 terms, 2 decisions, populated strategy).
- **3b.1 glossary:** every entry has `avoid: []` → zero rename candidates.
- **3b.2 decisions:** Droid decision has no `## Consequences` + names only platforms.md/hooks.json/SKILL.md (not touched by `.1`) → skip. Tracker-sync decision's `## Consequences` names make-pr/land.merged/status-projection code — `.1` touched `BACKEND_REGISTRY` + cursor helpers only, no tracker-sync code, no contradiction → no flag.
- **3b.3 strategy:** cursor backend is a 4th opt-in review CLI subprocess (same pattern as codex/copilot), flowctl core doesn't import it → consistent with "Cross-model review" pillar + "zero-dep base install"; not a hosted/SaaS/second-LLM-from-flowctl violation. No track-rename candidates.

**Phase 4:** Downstream `.2`/`.3`/`.4` carry no references that drifted. **Phase 4b:** CROSS_SPEC false → skipped. **Phase 5:** DRY_RUN + no drift → nothing to edit; `### Requirement coverage` table rows unaffected (`.1` covered R1–R4,R11 as tabled).

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Drift detected: no

- Completed task `fn-74…​.1` implemented exactly the specced contract (registry `efforts:None`/`default gpt-5.5-high`; `run_cursor_exec(prompt, session_id=None, *, spec, repo_root)` with `--mode ask --trust`, `cwd=repo_root`, no `--effort`, resume-only, prompt-too-large raise, 600s→non-zero; `cursor check` → `{available,version,authed,…}`). No naming/API/data-structure divergence.

Would update (DRY RUN): none — downstream tasks `.2`/`.3`/`.4` reference no drifted names or APIs (`.2`'s dependency on `run_cursor_exec` matches its built signature).

Would update traceability: none — `### Requirement coverage` table exists but no rows affected (task `.1` covers R1/R2/R3/R4/R11 as recorded; `satisfies` frontmatter matches).

Decision overrides flagged for review: none — neither active decision (Factory Droid platform; tracker-sync projection) names a file `.1` modified in a contradicting way.

Strategy drift flagged for review: none — the cursor review backend aligns with the Cross-model review approach + Cross-platform parity track and preserves the zero-dep base install (opt-in CLI subprocess, flowctl core does not import it).

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