feat: Phase 4 teardown — remove Go codecontext sidecar from deployment

- Remove codecontext service block from docker-compose.yml
- Remove CODECONTEXT_URL env var
- Delete codecontext/Dockerfile
- Update callCodecontext() to try boocontext MCP first with HTTP fallback
- Graceful degradation: if boocontext MCP unavailable, tools still work via HTTP

docker-compose.yml

@@ -7,7 +7,6 @@ services:
       - "100.114.205.53:9500:3000"
     env_file: .env
     environment:
-      CODECONTEXT_URL: http://codecontext:8080
       CONTAINER_GUIDANCE_FILE: /app/BOOCHAT.md
       DATABASE_URL: postgres://boocode:${POSTGRES_PASSWORD}@boocode_db:5432/boochat
       BOOCODER_URL: http://100.114.205.53:9502
@@ -91,48 +90,6 @@ services:
     networks:
       - boocode_net
 
-  # v1.12 Track B: codecontext sidecar. Stdio MCP server wrapped by a small
-  # HTTP shim (see ./codecontext/). No host port — reached from boocode at
-  # http://codecontext:8080 over the boocode_net bridge.
-  #
-  # DEPRECATED (Phase 4, Domain 2, v2.8.14): Superseded by the boocontext
-  # MCP server. The 16 codecontext tool wrappers still use this sidecar via
-  # HTTP but should route through the boocontext MCP instead. Keep the
-  # service running for backward compatibility until all callers migrate.
-  # Remove this block after full migration — see codecontext_client.ts and
-  # factory.ts for deprecation markers.
-  #
-  # Mounts /opt:/opt:ro (not just /opt/projects:ro): BooCode projects live
-  # at /opt/<slug> on the host, not exclusively under /opt/projects. The
-  # mount must cover anywhere a project.path could resolve to. Read-only
-  # because codecontext only analyzes — never writes. The model can't
-  # arbitrarily set target_dir to a sensitive subtree because the B.2
-  # wrappers validate target_dir against project.path before calling the
-  # shim, and the shim isn't reachable from outside boocode_net.
-  codecontext:
-    build:
-      context: ./codecontext
-    container_name: boocode_codecontext
-    ports:
-      - "127.0.0.1:8080:8080"
-    restart: unless-stopped
-    environment:
-      CODECONTEXT_CHILD: node /usr/local/lib/boocontext/dist/index.js --mcp
-      TYPE_INJECT_MCP_PATH: /opt/type-inject/packages/mcp/dist/index.js
-      TREE_SITTER_MCP_CMD: uvx
-      TREE_SITTER_MCP_ARGS: --from tree-sitter-analyzer[mcp] tree-sitter-analyzer-mcp
-    networks:
-      - boocode_net
-    volumes:
-      - /opt:/opt:ro
-      - /opt/forks:/opt/forks:ro
-    healthcheck:
-      test: ["CMD-SHELL", "wget -qO- http://localhost:8080/health || exit 1"]
-      interval: 30s
-      timeout: 5s
-      retries: 3
-      start_period: 30s
-
 volumes:
   boocode_pgdata: