Addresses review feedback on #13193:
1. Reference-image flow no longer assumes write_file/read_file handle
binaries. vision_analyze produces a textual description; the binary
is optionally copied via terminal (cp/curl). The description is what
gets embedded in prompts.
2. image_generate's URL-only return is now explicit. Step 6 downloads
the returned URL to local disk via terminal (curl -sSL -o ...), then
verifies non-zero size before proceeding.
3. Removed "Please use nano banana pro..." line from prompts/system.md —
the backend is user-configured and not agent-selectable, so routing
hints in the prompt are misleading.
PORT_NOTES.md updated: prompts/system.md is no longer verbatim, and the
file-ops/backend-selection rows now reflect Hermes' actual tool surface
(write_file/read_file for text, terminal for binaries and URL downloads,
vision_analyze for reading images).
a93de60b68