feat(server): add institutional memory recall

- File-based memory under .boocode/memory/ (project/user/reference topics)
- Hierarchical 4-scope scan: global → home → project → session
- Keyword/tag relevance matching for query-based recall
- Injected as <boocode-memory> block in system prompt at assembly
- v1 recall-only (extract/dream deferred to v2)

apps/server/src/services/system-prompt.ts

@@ -22,6 +22,8 @@ import { readFile, stat } from 'node:fs/promises';
 import type { Agent, Project, Session } from '../types/api.js';
 import { getAgentsMtimes } from './agents.js';
 import { resolveRoute } from './inference/provider.js';
+import { loadMemoryForSession } from './memory/recall.js';
+import { formatMemoryBlock } from './memory/prompt.js';
 
 const BASE_SYSTEM_PROMPT = (projectPath: string) =>
   `You are BooCode Chat, a code investigation assistant. The user is working on a project located at ${projectPath}. Use the file-read tools (view_file, list_dir, grep, find_files) to investigate code when needed. Be concise. Cite file paths and line numbers when discussing code. Do not hallucinate file contents — read the file first. Tool results may be truncated; if so, narrow your query rather than guessing.`;
@@ -164,7 +166,11 @@ export async function buildSystemPromptWithFingerprint(
   let out = BASE_SYSTEM_PROMPT(project.path);
   const guidance = await getContainerGuidance();
   if (guidance) {
-    out += `\n\n--- Container guidance ---\n${guidance}\n--- end container guidance ---\n`;
+    out += '\n\n--- Container guidance ---\n' + guidance + '\n--- end container guidance ---\n';
+  }
+  const memory = await loadMemoryForSession(project.path, session.id).catch(() => []);
+  if (memory.length > 0) {
+    out += '\n\n' + formatMemoryBlock(memory);
   }
   if (agent && agent.system_prompt.trim().length > 0) {
     out += '\n\n' + agent.system_prompt.trim();