💡 Change Scope

• Small Change: Fast feedback, localized UI/logic, low-risk.
• Large Change: New feature, cross-boundary logic, runtime-risk (persistence, IPC, lifecycle, recovery).

📝 What Does This PR Do?

Fixes the standalone installer release asset semantics so nightly and stable no longer share the same ambiguous script assets.

What changed:

• Generate tag-pinned installer/uninstaller assets for every release, with filenames that include the release tag.
• Nightly releases now publish only the tag-pinned installer assets, and those scripts default to downloading assets from that exact nightly tag.
• Stable releases publish both the tag-pinned installer assets and the generic opencove-install.* / opencove-uninstall.* aliases.
• The generic aliases continue to default to releases/latest/download, so they always track the latest stable release.
• Release publishing now uploads the generated installer assets from release-assets/* instead of the raw repo templates.
• Added a unit test that locks down the nightly vs stable asset matrix and the default download URL behavior.

🏗️ Large Change Spec (Required if "Large Change" is checked)

N/A. This PR is a localized release-asset behavior fix.

✅ Delivery & Compliance Checklist

• My code passes the ultimate gatekeeper: pnpm pre-commit is completely green.
• I have signed the CLA if required (see CLA.md).
• I have included new tests to lock down the behavior (or explicitly stated why it's untestable).
• I have strictly adhered to the DEVELOPMENT.md architectural boundaries.
• I have attached a screenshot or screen recording (if this touches the UI).
• I have updated the documentation accordingly (if adding a feature or changing a contract).

Verification completed:

• pnpm exec vitest run tests/unit/scripts/release-installer-assets.spec.ts
• OPENCOVE_RELEASE_TAG=v0.2.0-nightly.20260501.1 node scripts/generate-release-installer-assets.mjs /tmp/opencove-release-assets-nightly
• OPENCOVE_RELEASE_TAG=v0.2.1 node scripts/generate-release-installer-assets.mjs /tmp/opencove-release-assets-stable
• pnpm line-check:staged
• pnpm naming-check:staged
• pnpm secret-check:staged
• pnpm format-check:staged
• pnpm test:staged

Not run:

• pnpm pre-commit (full suite not necessary for this localized release asset fix)
• Docs updates were intentionally left out of this PR because the corresponding local docs files already have unrelated in-progress edits in the working tree.

📸 Screenshots / Visual Evidence

N/A: no UI surface changed.