feat: Domain 2 Phase 3-4 — wiki article tool, DCP compress toggle, Go sidecar deprecation

Phase 3: get_wiki_article tool wraps codesight_get_wiki_article MCP
(cached, persistent codebase wiki). DCP compress toggle on
get_codebase_overview (compress=true for large projects >50 files).

Phase 4: Deprecation markers on Go codecontext sidecar. Warning log
in callCodecontext(), deprecation comments in factory.ts and
docker-compose.yml. Sidecar remains functional — removal deferred.

apps/server/src/services/codecontext_client.ts

@@ -1,3 +1,10 @@
+// DEPRECATED (Phase 4, Domain 2, v2.8.14): This HTTP client routes through
+// the Go codecontext sidecar (http://codecontext:8080). Superseded by the
+// boocontext MCP server. New callers should use boocontext MCP tool wrappers
+// directly. Keep this file for backward compatibility — the 16 existing
+// codecontext tool wrappers (under tools/codecontext/) still call through
+// callCodecontext(). Remove after full migration.
+//
 // v1.12 Track B.2: shared HTTP client for the codecontext sidecar. The 8
 // per-tool wrappers under tools/codecontext/ all funnel through callCodecontext
 // — they're thin adapters that supply toolName + args + projectPath. The
@@ -112,6 +119,11 @@ export async function callCodecontext(
   req: CodecontextRequest,
   fetcher: typeof fetch = fetch,
 ): Promise<CodecontextResponse> {
+  // DEPRECATED: This function routes through the Go codecontext sidecar at
+  // http://codecontext:8080. New callers should use boocontext MCP instead.
+  console.warn(
+    `[deprecated] callCodecontext("${req.toolName}") — route through boocontext MCP instead`,
+  );
   // Step 1: realpath the project root, then realpath the requested target_dir
   // (defaulting to projectPath when the caller didn't pass one — the 12 wrappers
   // never pass target_dir; tests can override). A non-existent target_dir