feat(plugin-godot): add "Export Godot project" action

[Armaldio]

Summary

Adds a new Godot plugin with a single "Export Godot project" action that exports a Godot 4.x project for Windows, Linux, macOS or Web.

• Only required input: the Godot 4.x project folder (project.godot).
• Target platform: select (Windows/Linux/macOS/Web), defaulting to the host platform.
• Presets: auto-detects a matching preset from export_presets.cfg; when none matches, it appends a generated one (Pipelab <Platform>, unique-name-suffixed).
• Toolchain: downloads the official Godot 4.4.1 headless editor + export templates into <userData>/thirdparty/godot on first use, reusing the shared downloadFile/fileExists/runWithLiveLogs helpers (respects abortSignal, logs via log).
• Export: runs godot --headless --export-release <preset> <output> in the project folder.
• Outputs: emits output, parentFolder, folder following the plugin-construct conventions.
• Changeset: .changeset/godot-plugin.md (@pipelab/app, minor). No manual version bump.

Verification

• pnpm test:unit: 13 files / 45 passed | 1 skipped
  • godot.spec.ts (21 tests) mocks the Godot CLI and covers preset discovery/generation, command building, download/extract, and output paths.
  • godot-registration.spec.ts (2 tests) proves the plugin appears in registerBuiltIn() and getFinalPlugins().
  • godot.integration.spec.ts runs a real export whenever a Godot 4.x binary is reachable; otherwise it skips with an explicit reason (tried $GODOT_BIN and godot on PATH).
• pnpm typecheck:node: 59 errors — the pre-existing baseline, none introduced.
• ESLint clean on the new files.

Honest note

A real Godot export could not be executed in this environment (no Godot binary reachable). The integration test will run for real wherever Godot 4.x + its export templates for 4.4.1 are installed (or GODOT_BIN is set).

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