feat: dream cycle — drives-driven unattended consolidation + reflection

Lyra's inner loop for when no one's talking to her. Each pass senses her own
backlog/novelty, lets four drives build from real signals, and acts on those
past threshold:
- continuity -> summarize sessions with new turns
- coherence  -> rebuild profile/eras/narrative (stale once new gists land)
- curiosity  -> reflect() and evolve the self-state
- stability  -> readout of how caught-up she ended up

Drives are rendered into chat context so she can feel them. Causal chain:
consolidation creates gists -> coherence rises -> integration fires next.

- lyra/dream.py: dream_cycle() + lyra-dream CLI (--force, --loop SECONDS)
- memory: backlog_stats(), profile_sessions_covered(), WAL + busy_timeout
  so a separate dream process coexists with the web server
- self_state: DEFAULT_DRIVES baseline + drives in render_for_context
- tests/test_dream.py: backlog sensing + a full forced pass (LLM stubbed)

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

tests/test_dream.py

@@ -0,0 +1,78 @@
+"""Dream-cycle tests: backlog sensing + a full forced pass, with LLM/embeddings
+stubbed so nothing hits a real backend."""
+from __future__ import annotations
+
+import importlib
+
+import pytest
+
+
+@pytest.fixture
+def lyra(tmp_path, monkeypatch):
+    """A fresh Lyra wired to a temp DB with stubbed embeddings + LLM."""
+    monkeypatch.setenv("LYRA_DB_PATH", str(tmp_path / "test.db"))
+    monkeypatch.setenv("SUMMARY_BACKEND", "local")
+
+    from lyra import llm
+    # Deterministic 3-d embeddings; content-insensitive is fine for storage tests.
+    monkeypatch.setattr(llm, "embed", lambda texts: [[0.1, 0.2, 0.3] for _ in texts])
+    # reflect() expects JSON back; everything else just stores the text.
+    monkeypatch.setattr(
+        llm, "complete",
+        lambda messages, backend=None, model=None:
+        '{"mood":"focused","valence":0.7,"new_reflections":["I got some thinking done."]}',
+    )
+
+    import lyra.memory as memory
+    importlib.reload(memory)  # drop any cached connection from another test/db
+    return memory
+
+
+def _seed(memory, session_id, n, summarized_up_to=None):
+    ids = [memory.remember(session_id, "user", f"msg {i}") for i in range(n)]
+    if summarized_up_to is not None:
+        memory.store_summary(session_id, "gist", ids[summarized_up_to])
+    return ids
+
+
+def test_backlog_stats(lyra):
+    memory = lyra
+    _seed(memory, "s-fresh", 5)                       # never summarized -> ripe
+    _seed(memory, "s-ripe", 25, summarized_up_to=0)   # 24 new turns -> ripe
+    _seed(memory, "s-clean", 3, summarized_up_to=2)   # caught up -> not dirty
+
+    stats = memory.backlog_stats(ripe_threshold=20)
+    assert stats["sessions"] == 3
+    assert stats["dirty"] == 2
+    assert stats["ripe"] == 2
+    assert stats["max_exchange_id"] == 33
+
+
+def test_dream_cycle_consolidates_and_persists(lyra):
+    memory = lyra
+    from lyra import dream
+
+    # A big backlog: enough never-summarized sessions that continuity saturates
+    # and the resulting fresh gists push coherence past threshold too.
+    for k in range(7):
+        _seed(memory, f"s{k}", 4)
+
+    state = dream.dream_cycle(force=False)
+
+    # continuity built up and fired -> sessions got summarized
+    assert len(memory.list_summaries()) == 7
+    acts = state["dream"]["last_actions"]
+    assert any("consolidated" in a for a in acts)
+    # 7 fresh gists -> coherence crossed threshold -> profile got integrated
+    assert any("integrated" in a for a in acts)
+    assert memory.get_profile() is not None
+
+    # drives + bookkeeping persisted and reload-able
+    assert set(state["drives"]) == {"continuity", "coherence", "curiosity", "stability"}
+    assert state["dream"]["cycle_count"] == 1
+    assert memory.get_self_state()["dream"]["last_exchange_id"] == 28
+
+    # a second pass with no new activity should rest (continuity relieved)
+    state2 = dream.dream_cycle(force=False)
+    assert state2["dream"]["cycle_count"] == 2
+    assert state2["drives"]["continuity"] == 0.0