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_guru5070_rust_toolchain.md

@@ -23,7 +23,7 @@ built/linted/tested locally — **no more build-host (172.16.3.30) round-trips j
 
 **How to apply:** when a Coding Agent works on GuruConnect Rust, have it self-verify with the local toolchain
 (set PROTOC, run the four gates, iterate to green) and commit CI-green code — don't delegate fmt/clippy to the
-build host. See [[project_guruconnect_v2_direction]].
+build host. See [[project_guruconnect]].
 
 **CI fmt gate — don't omit it from agent briefs (incident 2026-05-31):** the CI `Build Server (Linux)` job runs
 `cargo fmt --check` as a hard gate FIRST (before build/test). SPEC-004 Task 2 + Task 4 (commits ffca7f0, 4e80573)