fix(pi-claude-cli): rewrite bare custom tool refs in system prompt to MCP names

Triage system prompts read "MUST call fn_review_spec()" but Sonnet 4.6 routed
through pi-claude-cli writes PROMPT.md and silently skips the call — even with
the addendum explaining the deferred-tool protocol. Confirmed by the FN-2564
agent log: model called other MCP tools (fn_memory_search, fn_task_list) fine
but consistently never reached fn_review_spec, leaving triage looping on
"fn_review_spec was never called" and falling back to zai/glm-5.1 every time.

Rewrite bare `fn_*` (and any non-built-in custom tool name) references in the
system prompt to their `mcp__custom-tools__fn_*` form before sending. The
prompt now literally says "call mcp__custom-tools__fn_review_spec()" so the
model has no inference step, and the deferred-tool reminder Claude Code injects
matches verbatim. Word-boundary safe (won't touch fn_review_specifier) and
idempotent (won't double-prefix already-MCP-named occurrences).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/init.ts

@@ -149,6 +149,12 @@ export async function runInit(options: InitOptions = {}): Promise<void> {
  * Detect a project name from git remote or directory name.
  */
 async function detectProjectName(dir: string): Promise<string> {
+  // Fast-path for non-git directories to avoid spawning git unnecessarily.
+  // (This also prevents occasional command stalls in constrained CI envs.)
+  if (!existsSync(join(dir, ".git"))) {
+    return basename(dir) || "my-project";
+  }
+
   // Try git remote first
   try {
     const { stdout: remoteUrl } = await execAsync("git remote get-url origin", {