fix: add all missing source files (llm.ts, updated agent-runner/agents)

src/llm.ts was never committed — this caused the Docker build to fail
with "Cannot find module './llm'". Also commit updated agent-runner.ts,
agents.ts, and .env.example that reference the new LLM client.

Made-with: Cursor

.env.example

@@ -1,23 +1,48 @@
-# Google AI — required for all agents
+# ---------------------------------------------------------------------------
+# AI Models — 3-tier routing
+# ---------------------------------------------------------------------------
+
+# Tier A — fast/cheap: routing, summaries, log parsing (Gemini Flash)
+TIER_A_MODEL=gemini-2.5-flash
+
+# Tier B — workhorse coder: features, diffs, standard bug fixes (GLM-5 on Vertex)
+TIER_B_MODEL=zai-org/glm-5-maas
+
+# Tier C — premium escalation: architecture decisions, complex debugging
+# Options: zai-org/glm-5-maas | anthropic/claude-sonnet-4-6
+TIER_C_MODEL=zai-org/glm-5-maas
+
+# Orchestrator model (defaults to Tier B if not set)
+ORCHESTRATOR_MODEL=B
+
+# Tier A fallback — Gemini API key (required if using gemini-* models)
 GOOGLE_API_KEY=your-gemini-api-key
 
-# Gitea — required for git push, issue management
+# GCP project for Vertex AI (GLM-5, Claude Sonnet via Vertex)
+GCP_PROJECT_ID=master-ai-484822
+
+# ---------------------------------------------------------------------------
+# Gitea — required for git push and issue management
+# ---------------------------------------------------------------------------
 GITEA_API_URL=https://git.vibnai.com
 GITEA_API_TOKEN=your-gitea-token
 GITEA_USERNAME=your-gitea-username
 
+# ---------------------------------------------------------------------------
 # Coolify — required for deployment tools
+# ---------------------------------------------------------------------------
 COOLIFY_API_URL=https://coolify.vibnai.com
 COOLIFY_API_TOKEN=your-coolify-token
 
+# ---------------------------------------------------------------------------
 # Server config
+# ---------------------------------------------------------------------------
 PORT=3333
 
-# Base path where agent workspaces are cloned
-# Each repo gets a subfolder: /workspaces/owner_reponame
+# Base path where agent workspaces are cloned (owner_reponame subdirs)
 WORKSPACE_BASE=/workspaces
 
-# Optional: internal URL of this service (used by spawn_agent to self-call)
+# Internal URL of this service (used by spawn_agent to self-call)
 AGENT_RUNNER_URL=http://localhost:3333
 
 # Optional: shared secret for validating Gitea webhook POSTs