Sweeping the memory store

1. Inventory. Run stayfixed memory inventory --json: every note with its word count,
   type, provenance and staleness. Sort by words, descending; the tail above ~400 words is
   where the value is.
2. Verify anchors before cutting. For each note, open the ledger entry behind every
   identifier it names and confirm the pull requests it cites are merged. This is the sweep's
   own job and nothing does it for you: the ledger's scan reads the repository's tracked files
   and skips symlinks, so a store that is git-ignored or linked in is invisible to
   stayfixed bugs check. A pointer to nothing is worse than the retelling it replaced.
3. Rewrite to rule plus pointer. Keep the rule, one line of why, how to apply, and a bare
   identifier for the evidence. History belongs to the ledger, the roadmap or the retro.
4. Merge on close coupling. Two notes firing on the same trigger, or each needing the
   other to be usable, are one note. A fact mechanized elsewhere is deleted, not kept.
5. Check the graph and the pointers out of the store. Run stayfixed memory refs: every
   backticked repository path a note names still exists, and, as notices that never change
   the exit code, every [[link]] resolves, no link is immediately repeated, no identifier is
   bracketed — advice, not a gate, since the store is shared by every session on the machine.
   Only exit 0 is a pass. Exit 2 means a configured group could not be resolved, so the walk
   covered a subset; fix that before an exit 0 means anything. Exit 1 is either stale paths —
   fix them, or rewrite in italics the ones where a note deliberately records a file that is
   gone — or no store resolving at all, which is a sweep that covered nothing. The summary line
   says which; the number alone does not.
6. Regenerate the index. Run stayfixed memory index, then stayfixed memory index --check.
7. Hand the rewrites back for review. A rewritten note is unreviewed again, and so no longer a
   standing rule: tell the owner which notes changed, and leave stayfixed memory promote --changed
   to them once they have read the diff.

Conventions for what a note is and how the index routes: references/protocol.md.