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-6e28504ce25e1ba5896c68e39420d9abff368c62d9b5c9cb6600dd3461f8f786.json

@@ -0,0 +1,58 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT id, agent_id, workspace_id, title, shard, created_at, last_active_at\n         FROM sessions WHERE agent_id = $1\n         ORDER BY last_active_at DESC, id DESC",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 1,
+        "name": "agent_id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 2,
+        "name": "workspace_id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 3,
+        "name": "title",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 4,
+        "name": "shard",
+        "type_info": "Int2"
+      },
+      {
+        "ordinal": 5,
+        "name": "created_at",
+        "type_info": "Timestamptz"
+      },
+      {
+        "ordinal": 6,
+        "name": "last_active_at",
+        "type_info": "Timestamptz"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ]
+  },
+  "hash": "6e28504ce25e1ba5896c68e39420d9abff368c62d9b5c9cb6600dd3461f8f786"
+}