P1 backend: chat persistence, tc-llm providers, runtime loop, gateway SSE

- tc-db: sessions/messages/steps/runs/run_events repos (atomic seq assignment,
  history with ordered step traces, journal replay-from-offset); migration 0003
- tc-llm: provider-neutral ChatRequest/LlmEvent; ScriptedProvider (scenario
  TOML, word-level deltas, multi-turn tool legs — ships in production for
  e2e/air-gap smoke), AnthropicProvider (Messages SSE), OpenAiCompatProvider
  (vLLM/Ollama/llama.cpp); opt-in live tests via TC_LIVE_LLM=1
- tc-runtime: run loop with persist-before-emit event journal, real built-in
  clock.now tool, step rows on the reply message, tool-error resilience,
  broadcast channels for live attach
- tc-api: agent CRUD + settings/full (tenant-isolated, RBAC'd, audited),
  sessions create/list/history?tools=true, POST /api/gateway SSE with
  monotonic ids and exact resumeFrom journal replay (tested equal to live)
- teamclaw-server: config-driven provider factory

83 Rust tests green, all against real Postgres / real TCP.

Co-Authored-By: Claude Fable 5 <[email protected]>

.sqlx/query-920874ea7c9af6145486dfba2baacdbae8af6a9e76f20ab8d40b01981c9ecabc.json

@@ -0,0 +1,41 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT run_id, seq, event_type, payload\n         FROM run_events WHERE run_id = $1 AND seq > $2 ORDER BY seq",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "run_id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 1,
+        "name": "seq",
+        "type_info": "Int8"
+      },
+      {
+        "ordinal": 2,
+        "name": "event_type",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 3,
+        "name": "payload",
+        "type_info": "Jsonb"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid",
+        "Int8"
+      ]
+    },
+    "nullable": [
+      false,
+      false,
+      false,
+      false
+    ]
+  },
+  "hash": "920874ea7c9af6145486dfba2baacdbae8af6a9e76f20ab8d40b01981c9ecabc"
+}