fix(storage): respect MIN_RECORDING_VERSION in replay manifests

[DriftN2Forty]

Summary

• stamp binary replay manifests with VersionUtil.MIN_RECORDING_VERSION instead of copying the exact writer version into minimumViewerVersion
• keep recordedWithVersion as the exact plugin build that wrote the replay
• bump the maintained compatibility floor to 1.5.0-alpha.1 and update tests to use MIN_RECORDING_VERSION for current-version roundtrips
• document in AGENTS.md that replay-format or playback-breaking changes must bump VersionUtil.MIN_RECORDING_VERSION, including the manual Modrinth alpha lookup step when needed

Problem

Alpha-created recordings could be finalized with an overly strict manifest requirement because the archive finalizer wrote the current plugin version into both recordedWithVersion and minimumViewerVersion.

That made recordings created or recovered on prerelease lines look like they required an unrelated stable release, and once prerelease-aware version comparison was fixed, those replays were correctly rejected.

Fix

• write recordedWithVersion = pluginVersion
• write minimumViewerVersion = VersionUtil.MIN_RECORDING_VERSION
• keep incompatibility tests explicit by mutating the manifest or envelope requirement when a test actually wants a mismatch
• switch normal storage/export/codec tests away from hard-coded 1.4.0 runtime assumptions so they continue to reflect the maintained compatibility floor

Testing

• mvn test