feat: auto-project-detection + project stages

Three changes:

1. ABB-Space registered as a lead project with stage=lead in
   Trusted Project State. Projects now have lifecycle awareness
   (lead/proposition vs active contract vs completed).

2. Extraction no longer drops unregistered project tags. When the
   LLM extractor sees a conversation about a project not in the
   registry, it keeps the model's tag on the candidate instead of
   falling back to empty. This enables auto-detection of new
   projects/leads from organic conversations. The nightly pipeline
   surfaces these candidates for triage, where the operator sees
   "hey, there's a new project called X" and can decide whether
   to register it.

3. Extraction prompt updated to tell the model: "If the conversation
   discusses a project NOT in the known list, still tag it — the
   system will auto-detect it." This removes the artificial ceiling
   that prevented new project discovery.

Updated Case D test: unregistered + unscoped now keeps the model's
tag instead of dropping to empty.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_extractor_llm.py

@@ -130,17 +130,17 @@ def test_case_c_unregistered_model_scoped_interaction(tmp_data_dir, project_regi
     assert result[0].project == "p06-polisher"
 
 
-def test_case_d_unregistered_model_unscoped_interaction(tmp_data_dir, project_registry):
+def test_case_d_unregistered_model_unscoped_keeps_tag(tmp_data_dir, project_registry):
     """Case D: model returns unregistered project, interaction is unscoped.
-    Falls to empty (not the hallucinated name)."""
+    Keeps the model's tag for auto-project-detection (new behavior)."""
     from atocore.models.database import init_db
     init_db()
     project_registry(("p06-polisher", ["p06"]))
-    raw = '[{"type": "project", "content": "x", "project": "fake-project-99"}]'
+    raw = '[{"type": "project", "content": "x", "project": "new-lead-project"}]'
     interaction = _make_interaction()
     interaction.project = ""
     result = _parse_candidates(raw, interaction)
-    assert result[0].project == ""
+    assert result[0].project == "new-lead-project"
 
 
 def test_case_e_matching_model_and_interaction(tmp_data_dir, project_registry):