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/feedback_syncro_timer_first.md

@@ -1,18 +0,0 @@
----
-name: Syncro — use add_line_item for billing, not timers
-description: Syncro billing uses add_line_item directly. Timer workflow (timer_entry → charge_timer_entry) is not used. Overrides previous rule about timers being required.
-type: feedback
----
-
-**Rule:** Bill Syncro tickets with `POST /tickets/{id}/add_line_item` directly. Do NOT use `timer_entry → charge_timer_entry`.
-
-**Why:** Mike confirmed 2026-05-21 that the timer workflow is not used. The previous rule requiring timers was wrong and caused repeated billing failures (wrong product on the timer, product_id silently ignored by charge_timer_entry, etc.).
-
-**How to apply:**
-
-- `add_line_item` is the billing path for all work: labor, warranty, internal, hardware.
-- Set `product_id`, `quantity` (decimal hours), `price_retail` (fetched live), `name`, `description`, `taxable: false`.
-- Do not create timer entries as part of billing.
-- Timer endpoints still exist in Syncro but are not part of the ACG billing workflow.
-
-**Previous rule (SUPERSEDED):** "All work-time billing MUST go through timer_entry → charge_timer_entry." That rule is no longer in effect as of 2026-05-21.