Update PLAN.md: migrated to official basecamp/fizzy-cli

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: waynemsmith

PLAN.md

@@ -4,25 +4,27 @@ Current task context for fizzy-cli. Read at session start, update as work progre
 
 ## Current State
 
-No open issues. All PRs merged. CLI is stable at v1.0.2.
-
-## Recently Completed
-
-- [x] Fix list spacing in display and HTML generation — v1.0.2 (44a3cff)
-- [x] Fix pre-existing typecheck errors in client.ts (44a3cff)
-- [x] Fix agent mention quoting — removed `@"Full Name"` from SKILL.md, all mentions use `@FirstName` (b091bc8)
-
-- [x] **#10** @mentions in comments/descriptions — PR #11 (verified: Faraz confirmed notification)
-- [x] **#4** steps-check --on/--off idempotency + verbose step IDs — PR #12
-- [x] **#9** column rename/delete commands — PR #13
-- [x] **#3 + #5** code block rendering + literal \n fix — PR #15
-- [x] **#6** closed as duplicate of #4
-- [x] Improved CLI help (tips section, better descriptions)
-- [x] Synced SKILL.md (repo + env) with all features
-- [x] Remove dead references to fizzy-cli-legacy repo (3d52c44)
-- [x] Fix API reference path in CLAUDE.md (42fd416)
-- [x] **#1** Nested list support in markdown conversion (339bac6)
-- [x] **#2** Fix bullet list conversion (beffa62)
-- [x] Add download command for attachments (097df7d)
-- [x] Fix .env lookup to check CLI directory (d31b552)
-- [x] Initial commit: full TypeScript port from bash scripts (972565a)
+**Migrated to official basecamp/fizzy-cli (Go).** This TS/Bun repo is deprecated (renamed to `fizzy-cli-legacy-2`).
+
+Active work is on the fork: `~/g/fizzy-cli-fork` (`Concurrent-Systems/fizzy-cli`, fork of `basecamp/fizzy-cli`).
+
+## Active
+
+- [ ] basecamp/fizzy-cli#112 — @mention resolution PR, awaiting upstream review
+- [ ] Clean up test card #539 on Dev board
+
+## Next
+
+- [ ] Monitor PR #112 for feedback, iterate if needed
+- [ ] If merged: switch from fork binary to official releases
+- [ ] If rejected: maintain fork with upstream sync
+
+## Completed (2026-03-28)
+
+- [x] Evaluated official CLI vs custom — official wins (152 vs 38 commands)
+- [x] Installed official CLI v3.0.3, configured auth/account/board
+- [x] Forked to Concurrent-Systems/fizzy-cli, added @mention resolution in Go
+- [x] All tests passing (12 new mention tests + all existing)
+- [x] Updated SKILL.md (env + repo + embedded) with generic mention docs
+- [x] Submitted upstream PR basecamp/fizzy-cli#112
+- [x] Renamed old TS repo to fizzy-cli-legacy-2