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Closes #2244. Retrieval matches on concept, and concepts are language-agnostic: asking about a TypeScript union-find scores 0.72-0.73 against a PYTHON snippet, comfortably over the 0.68 bar. That is useful — a different-language solution gives you the shape even when the code isn't reusable — but the menu line said nothing about it, so the reader either dismissed a good structural reference or pasted Python into a .ts file. Worth noting this predates the concept-query change: raw TS code already matched the Python snippet at 0.73, because the embedder reads identifiers and structure semantically rather than syntactically. The fail state has been shipping quietly; #2242 only made it an intended use rather than an accident. - knowledge._note_to_item projects `language` from the data mirror, same shape as the existing verification projection — a plain column read, no body parsing. - The semantic arm carries language through on the item it builds; it is the arm where these arise, since a snippet recorded AT the path you're editing is almost never in another language. - _prior_art_line folds it into the marker: [similar 0.72 · python]. Together with the score rather than after the title, because the two jointly are the judgement being offered. - One explanatory line is added to the menu, and only when something on it is actually tagged. Two deliberate calls: LABEL, DON'T FILTER. A stricter threshold for foreign-language hits would suppress exactly the shape-borrowing this exists for. They were never the problem; their being undisclosed was. ONLY CLAIM A MISMATCH YOU CAN ESTABLISH. _foreign_language returns "" when either side is unknown — unrecognised extension, or a snippet with no recorded language. A wrong "· python" is worse than no tag. Same-language hits stay unlabelled, so the common case keeps a clean line and the preamble stays off the menu entirely. Operator-typed language names fold through an alias table first (py/python3 → python, tsx → typescript, c++ → cpp); unrecognised names pass through lowercased, which still makes an unknown-but-equal pair compare equal. Trap found while building: _note() in the tests is a MagicMock, so `note.data` auto-created a truthy mock that would have rendered its repr into a menu line. Both test helpers now set data = None explicitly. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs