Shared Agent Memory — retired

This hand-edited file drifted stale (it once taught retired facts — a fixed agent
count, "immutable random-hex" task slugs, an unauthenticated API). It is no longer
a source of truth. Its two jobs now live in canonical places:

• Distilled lessons — the curated agent lessons are now the Insight Bank
  (ActionGrade.banked), and the tracked doc is generated from it:
  docs/agents/shared/insights.md. Curate lessons into the bank with
  bin/agent-activity grade <activity-id> --disposition good|not --slug "…" --bank; regenerate
  the doc with bin/rails insights:doc. A fresh session will load them via the
  planned bin/session-insights SessionStart loader (once it lands). See
  ../system/memory.md.

• Operational reference — accounts / 1Password → ../modules/credentials.md
  and ../modules/credential-inventory.md; conventions → ../system/coding-standards.md;
  ecosystem status → ../ECOSYSTEM.md.

Do not add lessons here — they will be missed. Bank them instead.