build(web): replace Playwright MCP with project-scoped Playwright CLI

- feat: add `.agents/skills/playwright-cli/` with complete Skill
  markdown, agent interface, and 9 reference files covering session
  management, spec-driven testing, video recording, tracing, storage,
  request mocking, element attributes, test debugging, and running
  custom code
- feat: add `.playwright/cli.config.json` to configure the Playwright
  CLI
- feat: add `web/package.json` `playwright:cli` script that resolves
  `playwright cli` from the repo root
- build: remove `@playwright/mcp` dependency from `web/package.json`
- build: set `XDG_CACHE_HOME` in `mise.toml`
- build: delete `.codex/config.toml` (MCP server config)
- docs: update `README.md`, `docs/web/roadmap.md`,
  `docs/web/decisions.md`, and `web/README.md` to reflect the new
  Playwright CLI approach

web/package-lock.json

@@ -16,7 +16,6 @@
         "react-router": "^8.2.0"
       },
       "devDependencies": {
-        "@playwright/mcp": "0.0.78",
         "@playwright/test": "1.61.1",
         "@tailwindcss/vite": "^4.3.2",
         "@types/node": "^24.13.2",
@@ -583,23 +582,6 @@
         "node": "^20.19.0 || >=22.12.0"
       }
     },
-    "node_modules/@playwright/mcp": {
-      "version": "0.0.78",
-      "resolved": "https://registry.npmmirror.com/@playwright/mcp/-/mcp-0.0.78.tgz",
-      "integrity": "sha512-XLTUeA6mEN9sQ+hJ4dfG8EIkDbxS0K3Trc2RBkUJuf02TgE2FQRNTMtq/aJfhyRMINsRl/Ybc4sxcWLtFn4/TQ==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "dependencies": {
-        "playwright": "1.62.0-alpha-1783623505000",
-        "playwright-core": "1.62.0-alpha-1783623505000"
-      },
-      "bin": {
-        "playwright-mcp": "cli.js"
-      },
-      "engines": {
-        "node": ">=18"
-      }
-    },
     "node_modules/@playwright/test": {
       "version": "1.61.1",
       "resolved": "https://registry.npmmirror.com/@playwright/test/-/test-1.61.1.tgz",
@@ -2759,53 +2741,6 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
-    "node_modules/playwright": {
-      "version": "1.62.0-alpha-1783623505000",
-      "resolved": "https://registry.npmmirror.com/playwright/-/playwright-1.62.0-alpha-1783623505000.tgz",
-      "integrity": "sha512-6KV9h4PP3hqu4NaGdxxcijWfYh9LJcFI/R2sP4TTC4I5cFo3oRawN0ETlW5MkE3cQEgKhhoj0KUNz4sfpCT0Tg==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "dependencies": {
-        "playwright-core": "1.62.0-alpha-1783623505000"
-      },
-      "bin": {
-        "playwright": "cli.js"
-      },
-      "engines": {
-        "node": ">=20"
-      },
-      "optionalDependencies": {
-        "fsevents": "2.3.2"
-      }
-    },
-    "node_modules/playwright-core": {
-      "version": "1.62.0-alpha-1783623505000",
-      "resolved": "https://registry.npmmirror.com/playwright-core/-/playwright-core-1.62.0-alpha-1783623505000.tgz",
-      "integrity": "sha512-CPJZdsA/KGT2QQlekiV6Wt+QlQrZHVSZ6oiNtOI/bYYOIVLM8jfKGWTM4zQiyd4UN+40Cq4cA6lxmZHZbtPvJQ==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "playwright-core": "cli.js"
-      },
-      "engines": {
-        "node": ">=20"
-      }
-    },
-    "node_modules/playwright/node_modules/fsevents": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmmirror.com/fsevents/-/fsevents-2.3.2.tgz",
-      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
-      "dev": true,
-      "hasInstallScript": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ],
-      "engines": {
-        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
-      }
-    },
     "node_modules/postcss": {
       "version": "8.5.19",
       "resolved": "https://registry.npmmirror.com/postcss/-/postcss-8.5.19.tgz",