feat(cli): add trace CLI for inspecting trace files

[pavelfeldman]

Add npx playwright trace command group that allows interrogating trace files from the command line without launching a browser. All commands support --json for machine-readable output.

Also moves skill/ to tools/cli-client/skill/ and traceParser to tools/trace/ for better organization.

[github-actions]

Test results for "tests 1"

7 flaky

⚠️ [chromium-library] › library/beforeunload.spec.ts:130 › should support dismissing the dialog multiple times `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/popup.spec.ts:261 › should not throw when click closes popup `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/trace-viewer.spec.ts:1223 › should display language-specific locators `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/trace-viewer.spec.ts:1223 › should display language-specific locators `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-page] › page/page-request-continue.spec.ts:754 › propagate headers cross origin redirect after interception `@chromium-ubuntu-22.04-arm-node20`
⚠️ [firefox-page] › page/page-emulate-media.spec.ts:144 › should keep reduced motion and color emulation after reload `@firefox-ubuntu-22.04-node20`
⚠️ [playwright-test] › ui-mode-trace.spec.ts:290 › should not fail on internal page logs `@windows-latest-node20`

38814 passed, 845 skipped

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Merge workflow run.

[github-actions]

Test results for "MCP"

5481 passed, 343 skipped

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Merge workflow run.