phase: 178_split_thinking_levels

## Phase 178 — final verification pass: 100% green

**Verified (all 5 tasks complete in `complete/178_split_thinking_levels/`):**
- `config.py` rename (`llm_chat_thinking_level` default `low`) + new `llm_summary_thinking_level` (default `""`); two `CATALOG` rows; `.env.example` replaced; no stale old-key references (only intentional negative pins in tests)
- Wire split: `chat_stream()` → chat level, one-shot `chat()` → summary level (absent `extra_body` when empty); per-turn line reads chat level only

**Gates:**
- `uv run pytest -k "config and thinking" -v` → 7 passed (defaults + env overrides both knobs)
- `uv run pytest` (unit + integration) → 4170 tests, exit 0; `--cov=app` → **99%** (>90% ✓)
- `uv run ruff check .` clean; `uv run pyright` clean
- `uv run pytest tests/e2e/test_split_thinking_levels.py -v --no-cov` → 3 passed in isolation
- `test_admin_settings_panel.py` + `test_admin_settings_layout.py` → 17 passed in isolation

**Completion criteria:** all 6 test/doc criteria ✅ (admin GET lists both keys, old key gone — integration + E2E pins); commit + phase-dir move = harness's job.

**Documentation:** README.md — both new env vars correctly documented in the LLM (aipi) table with defaults/wire-mapping/off-rule, defaults match `config.py`, all `.env.example` vars covered: verified consistent, no changes needed. AGENTS.md — all referenced files/commands verified to exist, no phase-178 impact (no UI code change, A4): verified consistent, no changes needed.

**Decisions:** none required — no live changes made (E2E booted its own app subprocess against the existing DB).

**Next pending phase:** none — 178 is the last phase in `todo/`.

tests/unit/test_settings_catalog.py

@@ -96,19 +96,25 @@ def test_env_var_is_bare_key_upper_prefixed() -> None:
         assert env_var(key).startswith("BOR_")
 
 
-def test_llm_thinking_level_is_a_plain_live_overridable_row() -> None:
-    """Phase 172 (task 01): the new ``llm_thinking_level`` pair sits in
-    ``LLM (aipi)`` with the ``Thinking level`` label and is plain —
-    not ``secret`` (a free-form text value, like ``llm_chat_model``),
-    not ``restart_required`` (the LLM client reads the setting per
-    request via ``get_settings()`` — live), overridable (the overlay is
-    generic over ``str`` fields)."""
-    meta = CATALOG["llm_thinking_level"]
-    assert meta.group == "LLM (aipi)"
-    assert meta.label == "Thinking level"
-    assert "llm_thinking_level" not in SECRETS
-    assert "llm_thinking_level" not in RESTART_REQUIRED
-    assert "llm_thinking_level" not in NON_OVERRIDABLE
+def test_llm_thinking_levels_are_plain_live_overridable_rows() -> None:
+    """Phase 178 (task 01): the two thinking-level rows (the phase-172
+    knob, renamed + the new summary level) sit in ``LLM (aipi)`` with
+    the ``Chat thinking level`` / ``Summary thinking level`` labels and
+    are plain — not ``secret`` (free-form text values, like
+    ``llm_chat_model``), not ``restart_required`` (the LLM client
+    reads the settings per request via ``get_settings()`` — live),
+    overridable (the overlay is generic over ``str`` fields)."""
+    for key, label in (
+        ("llm_chat_thinking_level", "Chat thinking level"),
+        ("llm_summary_thinking_level", "Summary thinking level"),
+    ):
+        meta = CATALOG[key]
+        assert meta.group == "LLM (aipi)"
+        assert meta.label == label
+        assert meta.secret is False
+        assert key not in SECRETS
+        assert key not in RESTART_REQUIRED
+        assert key not in NON_OVERRIDABLE
 
 
 def test_docs_user_is_a_plain_live_overridable_row() -> None: