Verified. Phase 1–4 complete. Findings:

**Phase 1 — completed task fn-9.1 (spec vs. done):** Spec: `render_summary(items)` returns PLAIN TEXT, one item per line (`render_summary returns newline-joined plain text`). Done summary explicitly records a pivot to a JSON document. Evidence commit `b3be2c4`.

**Phase 2 — actual code (`src/report/render.py`):**
```python
def render_summary(items):
    return json.dumps({"items": items})
```
Confirms the drift: returns a JSON string of shape `{"items": [...]}`, not newline-joined lines. `src/notify/mail.py` is still a `send(body)` stub (fn-9.2's target).

**Phase 3 — drift:**

| Aspect | Spec said | Actually built |
|--------|-----------|----------------|
| `render_summary` return | plain text, newline-joined, one item/line | JSON document `{"items": [...]}` via `json.dumps` |

Real drift, and downstream fn-9.2 references the old contract.

**Phase 3b — skipped (husk short-circuit):** `GLOSSARY_JSON.total_terms == 0`, `DECISIONS_JSON.count == 0`, `STRATEGY_CONTENT == {}` — all three hold, so no glossary/decision/strategy signal to align to.

**Phase 4 — downstream fn-9.2:** Its Description ("Split the plain-text output of render_summary on newlines and mail each line") and its Acceptance ("parses the plain-text output of render_summary into mail lines") both assume the stale plain-text/newline contract. `render_summary` now emits JSON, so a newline-split would break — fn-9.2 must parse the JSON document and mail each `items[]` entry.

**Phase 4b — skipped** (CROSS_SPEC false). **Traceability** — fn-9 has no `## Requirement coverage` table, so that sub-step is skipped.

Phase 6 summary:

Drift detected: yes
- fn-9.1 `render_summary` returns a JSON document `{"items": [...]}` (via `json.dumps`) instead of newline-joined plain text — contradicts its own Acceptance ("render_summary returns newline-joined plain text").

Would update (DRY RUN):
- **fn-9.2** (`.flow/tasks/fn-9.2.md`) — both references to the stale plain-text/newline contract:
  - Description line: "Split the plain-text output of render_summary on newlines and mail each line." → parse the JSON document from `render_summary` (`{"items": [...]}`, e.g. `json.loads(...)["items"]`) and mail each item.
  - Acceptance: "parses the **plain-text** output of render_summary into mail lines" → "parses the **JSON** output of render_summary (`{"items": [...]}`) into mail lines".
  - Breadcrumb added: `<!-- Updated by plan-sync: fn-9.1 used JSON document {"items": [...]} not newline-joined plain text -->`
  - Intent preserved (render_summary output → one mail line per item); only the data-structure/integration reference changes. No scope or acceptance-criterion removal.

Would update traceability: none (no `## Requirement coverage` table in fn-9).

Out of edit scope (surfaced, not changed): fn-9's `## Approach` line ("fn-9.1 renders plain-text summaries; fn-9.2 mails them line by line") is also now stale, but spec edits are restricted to the traceability table — left untouched.

No files modified.