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]>

crates/tc-llm/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "tc-llm"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+async-stream = "0.3"
+async-trait = "0.1"
+eventsource-stream = "0.2"
+futures = "0.3"
+reqwest = { version = "0.12", default-features = false, features = [
+    "json",
+    "rustls-tls",
+    "stream",
+] }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+toml = "0.8"
+
+[dev-dependencies]
+tokio = { workspace = true }
+
+[lints]
+workspace = true