chore: add PROJECT_STATE.md to all active projects and clients

Establishes inter-session coordination for 29 projects/clients:
- Full lock/component format for active projects (dataforth-dos,
  radio-show, cascades-tucson, valleywide, instrumental-music-center,
  lens-auto-brokerage, msp-audit-scripts)
- Light format for complete/stalled/planning (msp-pricing, pavon,
  wrightstown-*, gururmm-agent, community-forum, glaztech, etc.)
- Onboarding stubs for recently added clients

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

clients/at-trebesch/PROJECT_STATE.md

@@ -0,0 +1,56 @@
+# AT Trebesch — Project State
+
+> READ THIS before starting work on this client.
+> UPDATE THIS when you begin work (claim a lock) and when you finish (release lock + log changes).
+> Last updated: 2026-04-20
+
+---
+
+## Active Session Locks
+
+| Session | Working On | Status | Started |
+|---------|-----------|--------|---------|
+| _(none active)_ | | | |
+
+**How to claim a lock:** Add a row before starting work. Remove it when done. Locks older than 2 hours with no update are considered stale.
+
+---
+
+## Current State
+
+**Status:** ONBOARDING
+**Last Activity:** 2026-04-17
+
+New client. Standard directory structure applied 2026-04-17. Onboarding is in progress — initial files (overview.md, workstations.md) exist but onboarding tasks are not yet confirmed complete.
+
+---
+
+## Infrastructure / Access
+
+See `clients/at-trebesch/overview.md` for client overview.
+See `clients/at-trebesch/workstations.md` for workstation inventory.
+
+Other directories: `cloud/`, `issues/`, `network/`, `reports/`, `rmm/`, `security/`, `servers/`.
+
+---
+
+## Pending / Next Up
+
+- [ ] Complete onboarding — review `overview.md` and `workstations.md` for any gaps
+- [ ] Confirm infrastructure details (servers, network, credentials in vault)
+- [ ] Enroll in GuruRMM if applicable
+
+---
+
+## Recent Changes
+
+| Date | By | Change | Status |
+|------|-----|--------|--------|
+| 2026-04-17 | Howard | Standard client directory structure created; overview.md and workstations.md populated | IN PROGRESS |
+
+---
+
+## How to Update
+
+**When starting:** Add your session to Active Session Locks.
+**When finishing:** Remove your lock row, add entries to Recent Changes, update Current State if needed.