Prepare v0.1 release candidate

[BenedictChannn]

Summary

Prepares Deskagotchi for the v0.1 release-candidate pass.

• Adds the GitHub Pages landing page and launch/positioning docs.
• Updates README, desktop app docs, release notes, and manual QA guidance for the current v0.1 state.
• Locks and hardens the v0.1 renderer/release surface, including overlay click behavior and scope gates.
• Adds release QA coverage and stabilizes Windows installer smoke tests.
• Refreshes the closeout report with current automated evidence.

Validation

• Commit hooks passed lint and typecheck.
• cmd /c pnpm run qa:v2:automated-closeout passed with Completion status: complete.
• Release QA passed against the packaged Windows build and installer smoke.
• cmd /c pnpm run qa:v2:closeout still fails by design with Completion status: incomplete until required manual Windows acceptance is exported.

Remaining Before Public Release

This is intentionally a draft PR because the manual Windows acceptance pass is still pending:

• Installer install, launch, and uninstall on a real Windows machine.
• SmartScreen/unsigned-app warning observation.
• Desktop overlay click-through and drag feel.
• Multi-monitor/DPI sanity check.
• Sleep/resume and startup-toggle sanity check.
• Final visual feel pass for pets, food, panels, and animations.

[BenedictChannn]

@codex review this PR

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Handle saves whose active pet package is no longer loadable

reloadPackages() now keeps only built-in packages, but initialize() still loads existing saves and immediately calls progressActivePet(), which resolves activeState.packageId through getPetPackage(). For users who previously switched to an imported custom pet, that package ID is now absent, so startup throws Unknown pet package and the app cannot boot. Please add a migration/fallback path (e.g., remap active instance to a built-in package) before progressing simulation.

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