chore(memory): consolidate scattered feedback/project/reference files

Compressed memory store 104 -> 71 files via four passes:

- Syncro: 19 scattered feedback_syncro_* files merged into 3 rule files
  (api/billing/workflow) + an on-demand feedback_syncro_history.md for
  incident detail, quotes, and tech/product ID tables.
- Four near-duplicate merges: Howard paste-safety, Pluto build server,
  Howard backend deferral, IX server access (ssh+tailscale).
- Per-cluster rule/state/history split applied to GuruConnect (2->1),
  Dataforth (3->2), Cascades (7->3), GuruRMM (13->3).
- New reference_resource_map.md: single auto-loaded cheatsheet for
  "do I have access to X and how do I connect from this machine?"
- MEMORY.md rewritten to match the new layout.

Health: broken backlinks 8->7, overlap clusters 12->5, orphans 17->0.

.claude/memory/reference_ix_access_tailscale.md

@@ -1,7 +0,0 @@
----
-name: IX Server Access via Tailscale
-description: IX server (ix.azcomputerguru.com) is accessible with Tailscale on, no VPN needed
-type: reference
----
-
-IX server (ix.azcomputerguru.com / 172.16.3.10) can be accessed directly when Tailscale is on. No separate VPN connection required.