Add CLAUDE.md; point README at the build docs in raven

CLAUDE.md

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+# AyaNova v8 front end — instructions for Claude Code
+
+Shared AyaNova context and working rules, from the server repo (the master):
+@../raven/CLAUDE.md
+
+Everything below is specific to this repo.
+
+## What this is
+
+The AyaNova v8 web client, in `ayanova/`. Vue 2.6, Vuetify 2.6, Vuex, Vue Router, plain
+JavaScript (no TypeScript), Vue CLI 4 / webpack 4. Stack details:
+`../raven/devdocs/modernization/CODEBASE-REFERENCE.md`.
+
+## During the .NET 10 port
+
+The port is back-end only. **No changes in this repo** unless John asks, apart from a
+rebuild if the port needs one. Whether the client gets rebuilt in this pass is an open
+question in `../raven/devdocs/modernization/NET10-PORT.md`.
+
+If a port item touches the client (for example removing a package from both repos), it
+goes on a `net10-port` branch here too, with its own commit.
+
+## Constraints
+
+- **Node.js 12.22.9 exactly.** `fibers` breaks on anything newer. Check with `node -v` before building.
+- **No dependency changes**: no `npm install <package>`, no `npm update`, no version edits in `package.json`. Front-end upgrades are roadmap step F, not current work.
+- Install with `npm ci` (exact versions from `package-lock.json`), never `npm install`.
+- Vue 2 / Vuetify 2 are end of life. Do not upgrade them, and do not write Vue 3 style code.
+- Add `data-testid` attributes to elements that Cypress tests select.
+
+## Commands
+
+```powershell
+cd ayanova
+npm ci              # first time, or after package-lock.json changes
+npm run serve       # dev server with hot reload
+npm run build       # production build into dist\
+npm run lint
+```
+
+## How the build reaches the server
+
+`npm run build` writes to `ayanova\dist\`. `raven\build-release.bat` (or `buildrelease.bat`
+here) copies it into `raven\server\AyaNova\wwwroot\`. The .NET build does not produce
+`wwwroot`: whatever is there when the server is published is what ships.
+
+Webpack content-hash file names (`app.<hash>.js` …) change on every build even when the
+contents do not. Compare file contents, not names.
+
+Warnings on every build that are harmless: Browserslist "caniuse-lite is outdated"; Dart
+Sass division deprecation (from Vuetify); asset size (Monaco's workers).
+
+## Code layout
+
+`src/api/` API utilities, auth and error handling; `src/components/` about 80 components;
+`src/views/` about 100 pages; `src/plugins/` Vuetify setup; `router.js`, `store.js`,
+`main.js`, `App.vue`.
+
+View prefixes: `acc-` accounting, `adm-` administration, `cust-` customers, `home-`
+dashboard, `inv-` inventory, `ops-` server operations, `svc-` service (work orders, quotes,
+PMs).