The gateway's tool-progress path emits terminal commands as fenced code
blocks on any adapter whose supports_code_blocks is True. The Photon
adapter set that flag from PHOTON_MARKDOWN, but the sidecar's /send
router (send-format.mjs) silently routes every URL-bearing message
through the plain-text builder — where fences survive as literal backtick
characters — and even the markdown path renders a fence as inline
monospace text, not a block. Net effect: raw fenced terminal commands
(and raw markdown around them) surfaced in iMessage bubbles no matter
what the user's prompt-level style rules said.
Fix the whole class: the adapter never claims code-block support, so the
gateway emits its compact one-line tool preview instead. Prose markdown
passthrough (bold/italic/headings) is unchanged, and no config change is
required — tool_progress can stay at its user's preferred mode.
Tests: new capability + E2E tests pin that the gateway cannot emit a
fence for Photon with real adapter + real display resolution; the old
supports_code_blocks-mirrors-env expectation (which pinned the buggy
behavior) now asserts the flag is always False.
ccfb68688e