docs(log): one dated section per day, and the sweep's lesson learned

The day had three `## 2026-10-21` headings — three logs wearing one date, which is the sprawl the
spec's one-dated-section rule exists to prevent. One date now, one `###` per campaign. `okf-maintenance.md`
states the multi-campaign shape explicitly so nobody has to infer it, and names `AGENTS.md` as the
co-owner of the entry law so an editor changes both.

The new entry records what the dedupe sweep actually taught: an index that restates its own
reference pages becomes the stale authority, and a subagent ledger is a claim until it is re-read
against the file it accuses — most rows returned by the audit fan-out were checkably false, and
half the ledgers never arrived at all. `skills/ecosystem.md` gains the `resource:` frontmatter the
bundle's other externally-sourced pages carry.

Refs #64

omp-docs/skills/ecosystem.md

@@ -7,6 +7,7 @@ tags:
   - skills-sh
   - ecosystem
   - registry
+resource: https://skills.sh
 timestamp: 2026-10-19
 verified: 2026-10-19
 ---