feat: split introspection backend from consolidation (trial Dolphin for her voice)

reflect()/think() can now run on a different model than memory consolidation:
INTROSPECTION_BACKEND / INTROSPECTION_MODEL (default to SUMMARY_BACKEND, so unset =
unchanged). Consolidation (summaries/profile/narrative) keeps the capable model;
her *voice* (reflections, thoughts) can run a steerable tune. dream.py lets
reflect()/think() self-resolve to the introspection backend; both now thread a
`model` override into llm.complete.

Trial live: introspection -> dolphin3:8b on the 3090; consolidation -> Qwen-32B
on the MI50. Suite 73 green, ruff clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lyra/self_state.py

@@ -214,7 +214,7 @@ def wander_seed() -> str:
 
 
 def reflect(backend: Backend | None = None, session_id: str | None = None,
-            source: str = "manual") -> dict:
+            source: str = "manual", model: str | None = None) -> dict:
     """Reflect on recent activity and update the self-state. Returns new state.
 
     Two steps, not one: she drafts a reflection, then examines her own draft —
@@ -224,7 +224,9 @@ def reflect(backend: Backend | None = None, session_id: str | None = None,
     produces (reflections, the critique, and any deliberate journal note) is also
     appended to her permanent journal, tagged with `source`.
     """
-    backend = backend or config.load().summary_backend
+    cfg = config.load()
+    backend = backend or cfg.introspection_backend  # her voice (may differ from consolidation)
+    model = model or cfg.introspection_model
     state = load()
     state.setdefault("reflections", [])
     state.setdefault("metacognition", [])
@@ -269,7 +271,7 @@ def reflect(backend: Backend | None = None, session_id: str | None = None,
     # Step 1 — draft a reflection.
     draft = _safe_json(llm.complete(
         [{"role": "system", "content": _REFLECT_PROMPT}, {"role": "user", "content": body}],
-        backend=backend,
+        backend=backend, model=model,
     ))
 
     # Step 2 — examine her own draft and revise it into a more honest version.
@@ -279,7 +281,7 @@ def reflect(backend: Backend | None = None, session_id: str | None = None,
         revised = _safe_json(llm.complete(
             [{"role": "system", "content": _EXAMINE_PROMPT},
              {"role": "user", "content": examine_body}],
-            backend=backend,
+            backend=backend, model=model,
         ))
         if revised:  # fall back to the draft if the examine step doesn't parse
             update = revised