docs(ai): mark guides rewrite as merged in handoff and current task

Update HANDOFF.md, CURRENT_TASK.md, and SESSION_LOG.md to reflect
that PR #159 is being merged into main, replacing the in-flight
"uncommitted" language with the merged-state rollup.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.ai/SESSION_LOG.md

@@ -12,7 +12,7 @@
 
 ---
 
-## 2026-05-02 ~01:00 UTC — Claude — In-product User Guides Diátaxis rewrite (uncommitted)
+## 2026-05-02 ~01:00 UTC — Claude — In-product User Guides Diátaxis rewrite shipped (PR #159)
 
 - Audited the in-product `/guides` collection against live UI via `/browse` (engineer + owner test users). Existing 15 guides predated the FlowPilot pivot — every "click X in the sidebar" reference was wrong (Dashboard → Home, All Flows → Flows, Sessions → History, Exports gone, etc.). Three guides described surfaces that no longer exist: Maintenance Flows, AI Assistant page, Flow Assist Sparkles button. Findings written to `/tmp/guides-audit.md`.
 - Rebuilt `frontend/src/data/guides.ts` from scratch as 43 problem-oriented Diátaxis how-tos under 10 categories. Single-outcome each, terse imperative steps, real UI labels (Create New, Sign in, Manage, Build New Script, Send Invite, Save Settings, Create Category, etc.). Added `category: CategoryId` and optional `relatedSlugs?: string[]` to the `Guide` interface; new `Category` type and `categories` const drive the hub layout. `GuidesHubPage` now renders category sections (auto-hides empty); `GuideDetailPage` renders a Related guides footer; `GuideCard` lost its misleading "N sections" subtitle.