Mine: every transcript becomes a permanent, cross-referenced deposit

Manual transcript miner, idea-library builder, and library query tool. ONLY triggers when the user explicitly types /mine followed by a source reference (transcript file path, pasted transcript, a meeting or video URL, multiple URLs, an episode reference such as "ep 12" resolved through a connected recording tool, or "this session"), /mine ask followed by a question, or /mine pin followed by quotes to anchor. Do NOT auto-fire on "summarize this transcript," "what did they say," or content-creation asks. /mine deposits sources into a permanent idea library, runs collision, disagreement, and architecture passes against everything already banked, answers questions from the l…