Three caches that read config.yaml still keyed change detection on
st_mtime (or st_mtime_ns + st_size), so a same-size replacement that
keeps the old timestamp (cp -p, rsync -t, a timestamp-pinning writer)
was never noticed:
- model_tools._tool_defs_cache_key: get_tool_definitions kept serving
stale dynamic tool schemas / mcp_servers for the process lifetime.
- CLI mcp_servers auto-reload watcher (cli_tui_mixin seed +
cli_info_mixin._check_config_mcp_changes): the replaced mcp_servers
section was never reloaded. The seed is now _config_sig.
- tui_gateway/server._load_cfg_raw / _save_cfg (_cfg_mtime -> _cfg_sig):
the raw-config cache served the stale document and the next _save_cfg
would write it back over the on-disk file.
All three now use utils.file_signature like the rest of the PR. Tests that
reset the renamed module/instance attributes follow the rename; one
pinned-mtime replacement test per cache, red on the previous head.
Also corrects two stale type/comment annotations in hermes_cli/config.py
(_env_cache key shape, _RAW_CONFIG_CACHE record shape).
Review finding: three sibling config.yaml caches (tool-defs memo, CLI mcp watcher, TUI-gateway raw cfg) still compared mtime/size only.
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