Under `gateway.multiplex_profiles` one process serves every `<root>/profiles/*`,
but `_media_delivery_denied_paths` expanded `_ROOT_CREDENTIAL_PATHS` only under
the import-time `_HERMES_HOME` / `_HERMES_ROOT`. A `MEDIA:<root>/profiles/<B>/.env`
(or auth.json, state.db, config.yaml, sessions/, mcp-tokens/) emitted in ANY
profile's turn — including B's own, whose HERMES_HOME override was never
consulted — passed validation and was natively uploaded to the chat. The ALLOW
side (`_profile_cache_roots`) already enumerated profiles at check time; the
DENY side did not.
`_credential_home_roots()` now yields the active `get_hermes_home()`, the shared
root and every `<root>/profiles/*` at check time (shared `_profile_dirs()` with
the allow side), and the denylist is built from that. Profile cache artifacts
and plain agent-written files under a profile stay deliverable.
Live repro (/tmp/mux_audit/fix-media-denylist/repro.py): before, all five of
profiles/B/{.env,auth.json,state.db,config.yaml,sessions/s1.json} validated as
deliverable while <root>/.env was blocked; after, all None, cache/images/gen.png
and report.pdf still deliverable.
No prior report. Write-side analogue: #107327 / #107335 (memo keying, different
mechanism — left as is).
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