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-552dd276a90fe534077768e240d4241c6b1b884ebc18f3820104c2551f0d3ad3.json

@@ -0,0 +1,31 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "INSERT INTO messages (id, session_id, seq, role, content)\n         SELECT $1, $2, COALESCE(MAX(seq), 0) + 1, $3, $4\n         FROM messages WHERE session_id = $2\n         RETURNING seq, created_at",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "seq",
+        "type_info": "Int8"
+      },
+      {
+        "ordinal": 1,
+        "name": "created_at",
+        "type_info": "Timestamptz"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid",
+        "Uuid",
+        "Text",
+        "Jsonb"
+      ]
+    },
+    "nullable": [
+      false,
+      false
+    ]
+  },
+  "hash": "552dd276a90fe534077768e240d4241c6b1b884ebc18f3820104c2551f0d3ad3"
+}