docs: update CLAUDE.md with lessons 78-82 and current state

- Update phase to Go-to-Market Validation (Pre-PMF)
- Update in-progress and recently completed sections
- Lesson 78: Landing page subtitle branding
- Lesson 79: Custom modal mobile-responsive pattern
- Lesson 80: TopBar search collapses to icon on mobile
- Lesson 81: No transition: all in CSS
- Lesson 82: Bun PATH setup on devserver01

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

CLAUDE.md

@@ -1,6 +1,6 @@
 # CLAUDE.md - Patherly / ResolutionFlow Project Context
 
-> **Last Updated:** March 16, 2026
+> **Last Updated:** March 21, 2026
 
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@@ -53,7 +53,7 @@ When adding new pages/components: use "ResolutionFlow" branding, ice-cyan gradie
 
 ## Current State
 
-- **Phase:** Phase 3 - PSA Integration (In Progress)
+- **Phase:** Go-to-Market Validation (Pre-PMF)
 - **Backend:** Complete (35+ API endpoints, 100+ integration tests)
 - **Frontend:** Core features complete, Tree Editor functional
 - **Database:** PostgreSQL with Docker, 75 migrations
@@ -61,11 +61,15 @@ When adding new pages/components: use "ResolutionFlow" branding, ice-cyan gradie
 
 ### What's In Progress
 
-- ConnectWise PSA Integration (ticket linking, note posting, member mapping, status updates)
-- Knowledge Flywheel (Phase 3): AI analysis of FlowPilot sessions → flow proposals, review queue, analytics dashboard
+- Go-to-market validation: shadow MSP engineers, get product in front of real users
+- Landing page polish: mobile responsiveness, design audit fixes
+- Remaining open issues: #66 Templates + Import/Export, #60 Recurring Issue Detection, #58 Step Feedback Flag
 
 ### Recently Completed
 
+- Landing page design audit: hamburger menu, Privacy/Terms pages, branding alignment, mobile responsive modals, section spacing
+- Root directory cleanup: archived 9 completed docs, tracked marketing assets
+- GitHub issues triage: closed 10 stale issues (6 completed, 4 deferred)
 - FlowPilot Phase 2: PSA integration, escalation handoff, session pause/resume, mid-session ticket linking
 - Step Library Foundation
 - AI chat session conclusion: outcome tracking, AI-generated ticket summaries, resume flow
@@ -342,6 +346,16 @@ gh run view <id> --json jobs --jq '.jobs[] | {name: .name, conclusion: .conclusi
 
 **77. Prefer manual Alembic migrations for targeted changes:** `alembic revision --autogenerate` picks up drift from all tables. For single-column fixes, use `alembic revision -m "desc"` and write `op.alter_column()` manually.
 
+**78. Landing page subtitle is "AI-Powered Troubleshooting for MSPs":** Not "Decision Tree Platform". This tagline appears on login, register, and the HTML `<title>`. The old "Decision Tree Platform" was internal jargon misaligned with user-facing branding.
+
+**79. Custom modals must be mobile-responsive:** Use `items-end sm:items-center` (bottom-sheet on mobile, centered on desktop) and `max-w-full sm:max-w-lg` (full-width on mobile). The shared `Modal.tsx` does this correctly — custom modal implementations must follow the same pattern. See `PrepareSessionModal.tsx` for the fix pattern.
+
+**80. TopBar search collapses to icon on mobile:** Full search bar (`hidden sm:block`) shows on desktop; magnifying glass icon button (`sm:hidden`) shows on mobile (<640px). Both open the same CommandPalette. Don't add `w-full` search bar without the mobile icon fallback.
+
+**81. Never use `transition: all` in landing.css:** Specify exact properties: `transition: background 0.3s, border-color 0.3s, box-shadow 0.3s, transform 0.3s, opacity 0.3s`. `transition: all` animates layout properties and causes jank.
+
+**82. `bun` requires PATH setup on devserver01:** `export BUN_INSTALL="$HOME/.bun" && export PATH="$BUN_INSTALL/bin:$PATH"`. The gstack browse binary and Playwright need this. Chromium system deps: `libatk1.0-0 libatk-bridge2.0-0 libcups2 libxkbcommon0 libatspi2.0-0 libxcomposite1 libxdamage1 libxfixes3 libxrandr2 libgbm1 libasound2`.
+
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 ## RBAC & Permissions