feat: add source-backed Studio patch editing

[samohovets]

Summary

• Replace the visualizer-only Studio with a React and Vite serial patch editor.
• Preview scalar changes live and write supported literal and structural edits back to the configured TypeScript patch with revision-guarded undo and redo.
• Keep computed expressions read-only while preserving loopback capability security, keyboard performance, watcher-driven runtime activation, and oxfmt-formatted source output.
• Stabilize CLI lifecycle tests and avoid duplicate push and pull request validation jobs.

Changelog

Public summary:

• Patchwave Studio can now preview and write supported synth parameter and signal-chain edits directly back to consistently formatted TypeScript patches, with undo and conflict protection.

Context:

• TypeScript remains the source of truth; Studio only edits a conservative grammar of direct literals and inline patch structure.
• The browser sends closed semantic operations rather than paths, source code, or AST locations, and the CLI retains filesystem authority.
• Studio formats edited source with oxfmt, re-parses it, and only then performs the revision-guarded atomic write.
• This also adds the React device rack, inspector, device browser, source diagnostics, and automation-ready editor metadata.
• CI validation now uses deadline-based async test polling with guaranteed harness cleanup, and branch pushes with an open pull request no longer create duplicate jobs.

Verification

• pnpm validate
• pnpm validate:release
• pnpm --filter @patchwave/studio test
• pnpm --filter @patchwave/cli test
• Focused backpressure cleanup test passed 20 consecutive runs.
• pnpm check
• actionlint
• git diff --check
• Real-browser smoke: add Filter, observe source reload/native acceptance, undo, and verify the source SHA-256 is restored exactly.