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* fix(config): sign the bytes the config cache parsed, not a second read _load_and_cache_app_config parsed config.yaml through AppConfig.from_file and then called get_config_signature, which opens and hashes the file again. A write landing between those two reads left the cache holding the older content under the newer content's signature. get_app_config() compares the on-disk signature against the recorded one, so from then on it saw "unchanged" and the edit only surfaced when yet another edit changed the signature — silently stale until then, with no self-healing. Read the file once through a new shared helper, file_signature.read_config_with_signature, which returns the bytes together with the (mtime, size, sha256) of exactly those bytes, and parse them through AppConfig._from_yaml_text (from_file's body, split out; from_file itself is unchanged). The recorded signature now always describes the parsed content: a write that races the load can only produce a signature mismatch on the next call, i.e. one extra reload. Signing before parsing but re-reading for the parse would not be enough — an edit that lands between the two reads and is then reverted would be served forever — so the tests pin that the parsed bytes are the signed bytes. The stale-metadata reload test now routes the loader's read through the same stale-stat simulation it already applies to the probe, since the loader no longer records the probe's result. * docs(changelog): reference #5848 in the config cache entries --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>