The extract pipeline (extract_media/extract_images/extract_local_files +
directive strips) can reduce a non-empty tool-using response to empty
text_content with no deliverable attachment. The 'if text_content' send
guard then silently skips delivery: a 'response ready' log with no
'Sending response', no error, and the answer never reaches the user.
- A2: snapshot the pre-extract response; when extraction yields empty text
and no image/local/media attachment, deliver the recovered original from
the post-extract_media body (so a spaced MEDIA path can't leak). Applies
on ALL platforms (supersedes the Discord-only #33842 and the unsafe
raw-fallback #29499).
- A3: loud delivery invariant - a non-empty response that produces nothing
deliverable logs response_delivery_dropped at ERROR; every recovery logs
response_delivery_recovered. No silent drop survives.
- Factor a _strip_media_directives helper for the [[...]] strips; MEDIA
stripping stays owned by extract_media, whose grammar handles spaced and
quoted paths.
- Salvaged + de-scoped the #33842 test harness to all platforms; added
unrecoverable-drop and no-leak regression tests.
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