diff --git a/CLAUDE.md b/CLAUDE.md
index a66d4acd..70e498de 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -418,6 +418,18 @@ navigate(`/trees/${newTree.id}/edit`)
 
 **59. ConnectWise `clientId` is server-side config, not per-connection:** `clientId` is set in backend `config.py` as `CW_CLIENT_ID` — it identifies the ResolutionFlow integration app, not the MSP tenant. Per-connection credentials are only `company_id`, `public_key`, `private_key`, and `server_url`.
 
+**60. Dockerfile build args for Vite env vars:** Any new `VITE_*` or `VITE_PUBLIC_*` env var must be added as `ARG` + `ENV` in `frontend/Dockerfile` for Railway deploys. Railway env vars are runtime-only unless explicitly passed through as Docker build args. Without this, `import.meta.env.VITE_*` resolves to `undefined` in production builds.
+
+**61. Procedural sessions auto-start on page load:** `ProceduralNavigationPage` calls `startSession()` immediately in `loadTree()` — there is no intake form screen or "Start" button. Variables are filled inline during execution. Troubleshooting flows DO have a start screen with ticket/client fields. Don't write tests or UI that assume a Start button on procedural flows.
+
+**62. Playwright strict mode — scope selectors to avoid ambiguity:** Step titles appear in both the sidebar checklist and main content heading. Use `getByRole('heading', { name })` for the main content, or scope with `page.locator('.animate-scale-in')` for command palette items. `getByText()` frequently matches multiple elements due to the sidebar + main content layout.
+
+**63. Node 20 required for frontend builds:** Vite 7+ requires Node 20.19+. The system Node may be v18; use nvm: `export NVM_DIR="$HOME/.nvm" && source "$NVM_DIR/nvm.sh" && nvm use 20`. For direct binary access without nvm sourcing: `PATH="/home/michaelchihlas/.nvm/versions/node/v20.19.0/bin:$PATH"`.
+
+**64. PostHog product analytics:** Initialized via `PostHogProvider` in `main.tsx` with explicit `posthog.init()` + `client` prop pattern. Event helpers in `lib/analytics.ts` — use `analytics.eventName(props)` to track. `identifyUser()` called in `authStore.fetchUser()`, `resetAnalytics()` on logout. Env vars: `VITE_PUBLIC_POSTHOG_KEY`, `VITE_PUBLIC_POSTHOG_HOST`. Autocapture enabled.
+
+**65. Local Docker Compose uses `resolutionflow` database on port 5433:** Container name is `resolutionflow_postgres`, database is `resolutionflow` (not `patherly`), port mapped to `5433` (not `5432`). The `POSTGRES_PORT` env var controls this. Playwright config defaults must match: `postgresql+asyncpg://postgres:postgres@127.0.0.1:5433/resolutionflow`.
+
 ---
 
 ## RBAC & Permissions