**Phase 2–4 complete.** Analysis:

- **Grep confirms** `RP_ELIGIBLE` landed in both canonical skills (`flow-next-plan/SKILL.md`, `flow-next-plan-review/SKILL.md`) — matching spec R1's predicate name exactly. Guard idiom (`uname` Darwin OR `command -v rp-cli`), file set, suppression + re-lettering, byte-for-byte eligible path, and explicit-override passthrough all match the spec verbatim. No variable/API/data-structure drift.
- **Downstream fn-78…2** is mechanical (run `sync-codex.sh`, add `CHANGELOG` Unreleased, annotate `docs/platforms.md`/`troubleshooting.md`). It references "the eligibility gate" generically — never an internal name/signature that could go stale. The gate landed as `RP_ELIGIBLE`, exactly what .2 expects to propagate. No stale references.

**Phase 3b (not husk — glossary=38, decisions=2, strategy populated):**
- **3b.1 glossary:** every entry has `avoid: []` — no aliases to rename. Nothing to flag.
- **3b.2 decisions:** `factory-droid-*` names `flow-next-plan/SKILL.md` but its direction was "drop the `.factory-plugin/plugin.json` fallback"; the RP_ELIGIBLE gate neither re-introduces that fallback nor touches DROID_PLUGIN_ROOT/Execute — no contradiction (and it has no `## Consequences` section → skip). `tracker-sync-projection` Consequences name only tracker-sync concepts/config keys, none touched by this task. No overrides.
- **3b.3 strategy:** the gate *advances* the "Cross-platform parity" track and adds no external dependency (inline bash) — contradicts no track or the "zero external dependencies" approach. No track-rename patterns present. No drift.

**Phase 4b:** CROSS_SPEC=false → skipped. **Phase 5:** parent spec has no `## Requirement coverage` table; DRY_RUN=true and no drift → nothing to edit.

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Drift detected: no

**fn-78…1 implementation matches the spec.** The `RP_ELIGIBLE` gate (`uname == Darwin` OR `command -v rp-cli`) landed in both canonical skills with the exact predicate name, guard idiom, file set, clean re-lettering, byte-for-byte eligible path, and explicit-override passthrough the spec called for. No variable/API/data-structure divergence.

Would update (DRY RUN): nothing — downstream fn-78…2 references only "the eligibility gate" generically plus mechanical targets (`sync-codex.sh`, `plugins/flow-next/codex/**`, `CHANGELOG.md`, `docs/platforms.md`, `docs/troubleshooting.md`); none of its assumptions went stale.

Would update traceability: n/a — parent spec has no `## Requirement coverage` table.

Decision overrides flagged for review: none — `factory-droid-platform-status` (no `## Consequences`; the RP_ELIGIBLE change doesn't contradict its drop-`.factory-plugin` direction) and `tracker-sync-is-projection` (Consequences name only tracker-sync surfaces, untouched here) both clear.

Strategy drift flagged for review: none — the gate advances Cross-platform parity and adds no external dependency; no track contradiction, no rename candidates.

No files modified (DRY_RUN=true; no drift to act on regardless).