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/integration/test_admin_settings_live.py

@@ -10,9 +10,10 @@ snapshot, ``app/api/chat.py::get_llm``), and the chat concurrency
 semaphore (``chat_max_concurrent``). Plus the kill-switch counterpart
 (``BOR_SETTINGS_DB=0`` with rows present → env values are back) and
 the ``scripts/``-consumer surface (``import_extension_set``), and the
-phase-172 thinking level (``llm_thinking_level`` — the value the LLM
-layer reads per request via ``get_settings()``; the off switch is
-live-settable, A2).
+phase-172 thinking level (``llm_chat_thinking_level`` — the value the
+LLM layer reads per request via ``get_settings()``; the off switch is
+live-settable, A2) and its phase-178 summary twin (task 02:
+``llm_summary_thinking_level``, default ``""`` = off, A2).
 
 The rows are inserted directly through the ``db`` session (the admin
 API is task 04); the save itself is ``invalidate_settings()`` —
@@ -164,44 +165,88 @@ def test_llm_client_repoints_on_the_next_save(db: Session) -> None:
 
 
 # ---------------------------------------------------------------------------
-# the thinking level: save/reset resolve the live value (phase 172, task 02)
+# the chat thinking level: save/reset resolve the live value
+# (phase 178, task 01 — the phase-172 test, renamed)
 # ---------------------------------------------------------------------------
 
 
-def test_llm_thinking_level_live_apply_no_restart(
+def test_llm_chat_thinking_level_live_apply_no_restart(
     db: Session, monkeypatch: pytest.MonkeyPatch
 ) -> None:
-    """Phase 172 (task 02): the thinking level follows the overlay
+    """Phase 178 (task 01): the chat thinking level follows the overlay
     live — a save (the PUT's write, minus the API: ``_save`` +
     ``invalidate_settings()`` is exactly what task 04's PUT/DELETE
     call after the write) resolves
-    ``get_settings().llm_thinking_level`` WITHOUT a restart (the proof
-    the LLM layer — task 03 reads the setting per request via
+    ``get_settings().llm_chat_thinking_level`` WITHOUT a restart (the
+    proof the LLM layer — task 03 reads the setting per request via
     ``get_settings()`` — picks the override up live), the EMPTY value
     resolves live too (the off switch is live-settable, A2/A4), and a
     reset (the DELETE) returns the env value.
     """
     # A deterministic base (machine-independent, the kill-switch test's
     # idiom): the code default, no row in the table.
-    monkeypatch.delenv("BOR_LLM_THINKING_LEVEL", raising=False)
+    monkeypatch.delenv("BOR_LLM_CHAT_THINKING_LEVEL", raising=False)
     invalidate_settings()
-    assert get_settings().llm_thinking_level == "low"
-    _save(db, "llm_thinking_level", "high")
+    assert get_settings().llm_chat_thinking_level == "low"
+    _save(db, "llm_chat_thinking_level", "high")
     invalidate_settings()
-    assert get_settings().llm_thinking_level == "high"  # NO restart
+    assert get_settings().llm_chat_thinking_level == "high"  # NO restart
     # The off switch is live-settable too (A2/A4): the empty value
     # resolves through the overlay, not stripped or coerced.
-    _save(db, "llm_thinking_level", "")
+    _save(db, "llm_chat_thinking_level", "")
     invalidate_settings()
-    assert get_settings().llm_thinking_level == ""
+    assert get_settings().llm_chat_thinking_level == ""
     # The reset returns the env value (no process restart in between —
     # the LLM layer re-reads per request, task 03).
     db.execute(
-        text("DELETE FROM app_settings WHERE key = 'llm_thinking_level'")
+        text("DELETE FROM app_settings WHERE key = 'llm_chat_thinking_level'")
     )
     db.commit()
     invalidate_settings()
-    assert get_settings().llm_thinking_level == "low"
+    assert get_settings().llm_chat_thinking_level == "low"
+
+
+# ---------------------------------------------------------------------------
+# the summary thinking level: save/reset resolve the live value
+# (phase 178, task 02 — the chat twin's summary counterpart)
+# ---------------------------------------------------------------------------
+
+
+def test_llm_summary_thinking_level_live_apply_no_restart(
+    db: Session, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    """Phase 178 (task 02): the summary thinking level follows the
+    overlay live — a save (the PUT's write, minus the API: ``_save`` +
+    ``invalidate_settings()`` is exactly what task 04's PUT/DELETE call
+    after the write) resolves ``get_settings().llm_summary_thinking_level``
+    WITHOUT a restart (the proof the LLM layer — task 03 reads the
+    setting per request via ``get_settings()`` — picks the override up
+    live), the EMPTY value resolves live too (the off switch is
+    live-settable, A2/A4), and a reset (the DELETE) returns the env
+    value (``""`` — the code default; the chat twin's reset returns
+    ``"low"``, the two levels are independent).
+    """
+    # A deterministic base (machine-independent, the kill-switch test's
+    # idiom): the code default, no row in the table.
+    monkeypatch.delenv("BOR_LLM_SUMMARY_THINKING_LEVEL", raising=False)
+    invalidate_settings()
+    assert get_settings().llm_summary_thinking_level == ""
+    _save(db, "llm_summary_thinking_level", "high")
+    invalidate_settings()
+    assert get_settings().llm_summary_thinking_level == "high"  # NO restart
+    # The off switch is live-settable too (A2/A4): the empty value
+    # resolves through the overlay, not stripped or coerced.
+    _save(db, "llm_summary_thinking_level", "")
+    invalidate_settings()
+    assert get_settings().llm_summary_thinking_level == ""
+    # The reset returns the env value (no process restart in between —
+    # the LLM layer re-reads per request, task 03).
+    db.execute(
+        text("DELETE FROM app_settings WHERE key = 'llm_summary_thinking_level'")
+    )
+    db.commit()
+    invalidate_settings()
+    assert get_settings().llm_summary_thinking_level == ""
 
 
 # ---------------------------------------------------------------------------