mcp-permanent-server-count-drifts-silently-when-exemptions-not-counted

MEMORY.md documented 8 permanent MCP servers, but stitch was already session-cleanup-exempted without being counted, making the real total 9. The drift was silent and only discovered during session-close audit. Rule: whenever any server is added to the session-cleanup exemption list, the MEMORY.md permanent count must be updated in the same atomic operation — not deferred.