vouch-rememberlisted

# /vouch-remember Turn "$ARGUMENTS" into durable KB knowledge — proposed, never self-approved. Steps: 1. Call `kb_register_source` with the user's exact wording as `content` (`source_type: "message"`, a short descriptive `title`). Sources are evidence intake; registering one writes no knowledge. 2. Distill the durable fact(s) into one `kb_propose_claim` each, citing the registered source id in `evidence`. Keep each claim one sentence, present tense, self-contained. 3. If the fact is about a person, org, or project the KB doesn't know yet, also file `kb_propose_entity` (and `kb_propose_relation` to link it). 4. Report the proposal id(s) and remind the user: pending items are invisible to retrieval until a human runs `vouch approve <id>` or `vouch review`. Never call `kb_approve` — the human at the gate decides what the KB believes.