phase: 118_summary_seed_context

**Phase 118 final verification pass — complete.** All criteria verified; 4 pre-existing defects found and fixed.

- **Verified:** summary-seed wiring (`select_suggested` top-5 no-floor → summary blocks, no full text in HIGH prompt), all-doc markdown summaries + NULL backfill (`summary_backfilled`, no `sources_meta` bump), `read` adds full text with `read_docs`-only dedupe, `done.sources` = suggested+read / durable record = suggested+related+read + `suggested=N` log line (seen live in E2E), byte-locked PERSONA/LOW/TOOLS_SECTION, battery gate PASS recorded in `TOOL_CALLING_TESTING.md` §10 (turbo 2026-09-16: 1/2/4 GREEN, cond-3 reported 9/10 per A7, contract 21/21, caps 0).
- **Defects fixed (all pre-existing, none phase-118):** ① `ChatMessage` schema missing the phase-113 `related` key → `extra="forbid"` 422'd every done-time auto-save of grounded turns with a related tier, leaving `message_count=1` (root cause of `test_share_chat` 3F; browser-level instrumentation proved the PUT 422) — added the field + unit/integration pins; ② `test_theme_semantic_completion` pins stale vs phase-117 debox (border/chip removed) — re-targeted to assert border/chip *absence*; ③ `test_header_consistency` `<26`px pin red on 26.125px native date-input line — bound relaxed to `<34` (wrap-detection intent kept); ④ `test_navbar_refresh` bor.chat.v1 key set updated for `related`.
- **Test/lint/coverage:** `uv run pytest --cov=app --cov-report=term-missing` → **2506 passed, app/ 99%** (>90%); `uv run ruff check . && uv run pyright` → clean, 0 errors.
- **E2E:** new story suite in isolation → **2 passed**; full 103-suite matrix sweep (each isolated) → **all 103 green** after the fixes; `test_share_chat` 4 passed, `test_theme_semantic_completion` 8 passed, `test_header_consistency` 3 passed, `test_navbar_refresh` 7 passed.
- **Deviations:** none from LOCKED decisions. Note: orphaned diagnostic uvicorn processes briefly made E2E sessions exercise stale code — killed and re-verified; a sweep-regenerated tracked screenshot was restored. No commits made (harness commits).
- **Completion criteria:** all 7 ✅ (commit/phase-move is the harness's step).
- **Next pending phase:** none — `todo/` holds only this phase's overview pending the harness move.

app/schemas.py

@@ -388,9 +388,10 @@ class DocContent(BaseModel):
     path: str
     title: str
     format: str
-    #: Lite-model summary (phase 30) — non-markdown A9 docs only; None for
-    #: markdown documents, pre-phase-30 rows, and the fail-soft path where
-    #: summary generation failed but the document was still indexed.
+    #: Lite-model summary (phase 30) — every A9 doc, markdown included
+    #: since phase 118 A2; None for pre-phase-30 rows, the fail-soft path
+    #: where summary generation failed, and until the phase-118 backfill
+    #: stores one on the next sync.
     summary: str | None = None
     #: The document's creation date (phase 106, D8) — ISO-8601, verbatim
     #: from the row; the viewer's top meta row renders the ``Created``
@@ -742,14 +743,26 @@ class ChatMessage(BaseModel):
     """One conversation record in the ``bor.chat.v1`` localStorage shape
     (phase 14) — the stored ``messages`` payload of a saved chat (phase 50).
 
-    ``{who, text, sources?, deflected?, suggestions?, thinking?, tools?,
-    stopped?}`` — raw text, never HTML, so a saved chat restores
-    pixel-identical through the existing ``renderStoredMessage`` path.
+    ``{who, text, sources?, related?, deflected?, suggestions?,
+    thinking?, tools?, stopped?}`` — raw text, never HTML, so a saved
+    chat restores pixel-identical through the existing
+    ``renderStoredMessage`` path.
     ``extra="forbid"`` rejects unknown keys (a corrupted or HTML-shaped
     payload, e.g. a stray ``<b>``-ish extra key) at the boundary with a
     422, so nothing outside this shape can poison a restored
     conversation.
 
+    ``related`` (phase 113, the related-doc tier the UI persists with
+    every grounded brain record — the restore path re-renders the
+    de-emphasized row from it): the same :class:`SourceRef` list shape
+    as ``sources``, the same cap. Its absence from this model was a
+    phase-113 omission — the ``extra="forbid"`` boundary 422'd every
+    done-time auto-save carrying the key (the A2 quiet-failure path
+    swallowed it), leaving grounded turns' brain messages unsaved;
+    pinned by ``tests/integration/test_chats_api.py`` (the full brain
+    record carries ``related``) and the E2E ``test_share_chat``
+    auto-save count.
+
     Phase 83 (SEC-05) bounds the anonymous write surface (``POST/PUT
     /api/chats`` is public — the row id is the credential, phase 55 A1):
     ``text`` / ``thinking`` carry :class:`HistoryTurn`'s 32 000 caps
@@ -757,7 +770,8 @@ class ChatMessage(BaseModel):
     path, so a saved chat can never legitimately carry more), and the
     nested lists get length caps (``max_length``) sized to the realistic
     ``bor.chat.v1`` record the UI produces (``sources`` ≤ 20 — top-N docs
-    + agent reads; ``suggestions`` ≤ 50 chips of ≤ 200 chars; ``tools``
+    + agent reads; ``related`` ≤ 20 — the related-doc tier, same ref
+    shape; ``suggestions`` ≤ 50 chips of ≤ 200 chars; ``tools``
     ≤ 50 — one entry per tool call, the round cap is 10). Only value
     bounds were added — the accepted/rejected KEYS are unchanged.
     """
@@ -767,6 +781,7 @@ class ChatMessage(BaseModel):
     who: Literal["user", "brain"]
     text: str = Field(min_length=1, max_length=32_000)
     sources: list[SourceRef] | None = Field(default=None, max_length=20)
+    related: list[SourceRef] | None = Field(default=None, max_length=20)
     deflected: bool | None = None
     suggestions: list[_Chip] | None = Field(default=None, max_length=50)
     thinking: str | None = Field(default=None, max_length=32_000)