feat(server): inference state-graph + supervisor, memory tools, MCP client, schema, routes

- Add state-graph.ts: typed state machine for inference lifecycle
- Add supervisor.ts: agent supervisor pattern for multi-agent coordination
- Add export-formatter.ts: structured export formatting
- Add manage_memory.ts: memory CRUD tool for agent persistence
- Add get_wiki_article.ts: codecontext wiki article retrieval
- Extend memory/index.ts: 3-tier memory (context/daily/core)
- Extend MCP client: mcp-config.ts env-var substitution
- Update schema.sql: agent_sessions, tasks, pending_changes extensions
- Update API types: MessageMetadata, ErrorReason, AgentSessionConfig
- Update routes: chats, messages, sessions — column renames and agent_session_id
- Update inference: error handler, payload builder, stream phase, turn orchestrator

apps/server/src/services/tools/codecontext/get_wiki_article.ts

@@ -0,0 +1,61 @@
+import { z } from 'zod';
+import type { ToolDef } from '../types.js';
+import { callBoocontext } from '../../boocontext_client.js';
+
+export const GetWikiArticleInput = z.object({
+  article: z.string().min(1).describe('Article name (e.g. "auth", "database", "routes")'),
+  directory: z.string().optional().describe('Project directory'),
+});
+export type GetWikiArticleInputT = z.infer<typeof GetWikiArticleInput>;
+
+const DESCRIPTION =
+  'Returns a persistent codebase wiki article by name (auth, database, routes, etc.). ' +
+  'Generated on first request and cached to disk. Avoids running expensive full-scan tools for targeted documentation.';
+
+/**
+ * Standalone execute function — calls the boocontext MCP server's
+ * codesight_get_wiki_article tool and returns the article text.
+ *
+ * Structured for direct test access: accepts input + projectPath,
+ * no side effects beyond the MCP call.
+ */
+export async function executeGetWikiArticle(
+  input: GetWikiArticleInputT,
+  projectPath: string,
+): Promise<string> {
+  const args: Record<string, unknown> = { article: input.article };
+  if (input.directory) args['directory'] = input.directory!;
+  const resp = await callBoocontext({ toolName: 'codesight_get_wiki_article', args });
+  return resp.result;
+}
+
+export const getWikiArticle: ToolDef<GetWikiArticleInputT> = {
+  name: 'get_wiki_article',
+  description: DESCRIPTION,
+  inputSchema: GetWikiArticleInput,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'get_wiki_article',
+      description: DESCRIPTION,
+      parameters: {
+        type: 'object',
+        properties: {
+          article: {
+            type: 'string',
+            description: 'Article name (e.g. "auth", "database", "routes")',
+          },
+          directory: {
+            type: 'string',
+            description: 'Project directory',
+          },
+        },
+        required: ['article'],
+        additionalProperties: false,
+      },
+    },
+  },
+  async execute(input, projectRoot) {
+    return executeGetWikiArticle(input, projectRoot);
+  },
+};