When users switch opencode.json from pinned version to tag (e.g., 3.10.0 -> @latest),
the cache package.json still contains the pinned version. This causes bun install
to reinstall the old version instead of resolving the new tag.
This adds syncCachePackageJsonToIntent() which updates the cache package.json
to match the user's declared intent in opencode.json before running bun install.
Also fixes mock.module in test files to include all exported constants,
preventing module pollution across parallel tests.
Fixes#1920
Installer-written exact versions (e.g., oh-my-opencode@3.5.2) were incorrectly treated as user-pinned, blocking auto-updates for all installer users.
Fix isPinned to only block auto-update when pinnedVersion is an explicit semver string (user's intent). Channel tags (latest, beta, next) and bare package name all allow auto-update.
Fix installer fallback to return bare PACKAGE_NAME for stable versions and PACKAGE_NAME@{channel} for prerelease versions, preserving channel tracking.
When bun install fails after updating the config pin, the config now shows the
new version but the actual package is the old one. Add revertPinnedVersion() to
roll back the config entry on install failure, keeping config and installed
version in sync.
Ref #1472