Live inventory of all active endpoints and MCP tools. Use this to discover what the API can do before making calls.

Fix 4 step 3 (Session 2B-i): mcp_tool_count/mcp_tool_names now come from current_public_tools() -- the same canonical-registry-driven, rollback-flag-aware source /health, tools/list, and system_status all use -- rather than the raw _MCP_TOOLS list, which included internal- only tools never actually reachable via tools/list. That mismatch (this endpoint silently claiming a different tool count than /health) was itself a real instance of the "drift between MCP, REST, and documentation" this session's brief opens with.

Fix 6: schema_hash is served as this response's ETag. A client sending If-None-Match with a still-current hash gets a bare 304, not a re-fetched body -- and critically, a CHANGED schema can never keep serving an old body under an old ETag, since the ETag IS the content hash, not an independently-tracked version counter that could drift from what's actually being returned.