MEDIA: tags whose path had an unknown extension (.py, .log, .toml,
.weirdext, ...) fell between both extraction passes: the anchored
extension allowlist (MEDIA_TAG_CLEANUP_RE) did not match them, and the
extension-less pass explicitly skipped any path that HAD a suffix. The
file was never delivered even though the intended design (universal
ingress/egress) says any non-credential file should ship.
Widen _path_lacks_deliverable_extension() so the validated delivery
pass (MEDIA_EXTENSIONLESS_TAG_RE + validate_media_delivery_path)
covers every path the extension allowlist does not — unknown
extensions and extension-less files alike. Security posture is
unchanged: unknown-extension paths only deliver after full validation
(exists, symlinks resolved, credential/system denylist, strict-mode
allowlist+recency), and unvalidated tags stay visible in the text
instead of being silently dropped. Known extensions keep their
unconditional pre-existing behavior.
Because extract_media, _strip_media_tag_directives (non-streaming
dispatch), and strip_media_directives_for_display (streaming) all
share the same two regexes + predicate, all delivery paths pick up the
widened behavior with no per-site changes. Dispatch partition in
gateway/run.py already routes non-image/video extensions through
send_document.
Closes the gap reported in PR #36060; supersedes the allowlist-append
approach there (an extension allowlist can never enumerate every file
type a user asks the agent to produce).
Co-authored-by: Randimt <randimt@users.noreply.github.com>
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