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oh-my-pi/packages/coding-agent/test
Nik Divjak 630f9e5324 fix(xdev): bound device summaries in UTF-8 bytes and flag untrusted metadata
Catalog summaries of mounted xd:// devices are inlined verbatim into the
system prompt. External devices (MCP servers, plugins) supply that text, and
it was bounded only by character count: a summary of multi-byte script passed
roughly three times the intended budget, and control characters survived into
the prompt where they can forge structure.

Summaries now go through a single sanitize-and-bound step that strips C0/C1
control characters and bounds the result in UTF-8 bytes via the central
truncateHeadBytes helper, so a cut lands on a code point boundary and never
renders a partial code point. The built-in/external distinction is derived
once per entry, and that same boolean both selects the description cap and is
exposed as `dynamic`, so the cap and the flag cannot disagree. The prompt uses
the flag to state that dynamic summaries are untrusted metadata, and the mount
notice says the same for newly appeared devices.

(cherry picked from commit 5989da6235d820bc687779a791e655e6f1b2df0f)
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