feat(mediainfo): expose snapshot v2 negotiation

[SuperMonster003]

Summary

• expose mediainfo.capabilities through the embedded Node facade
• let mediainfo.read forward an explicitly selected plugin snapshot schema
• preserve the existing Node MediaInfo v1 result when schema is omitted
• update the media/recorder parity sample to negotiate v2 only when advertised

Narrow integration

This branch is based on origin/master and contains one focused runtime commit. It intentionally excludes the unpublished Node development-assets/type bundle, generated multilingual release notes, and build-number metadata from the longer local development line.

Coordination

• Plugin contract and implementation: feat: add opt-in snapshot v2 contract AutoJs6-Plugin-MediaInfo#3
• Host schema negotiation and Rhino/Node bridge: https://github.com/SuperMonster003/AutoJs6-Private/pull/4
• Node Runtime facade: feat(mediainfo): expose snapshot v2 negotiation #1
• API documentation: docs(mediainfo): document snapshot v2 negotiation AutoJs6-Documentation#15
• TypeScript declarations: feat(mediainfo): declare snapshot v2 APIs AutoJs6-TypeScript-Declarations#8

All five pull requests remain Draft and should be reviewed as one coordinated contract set. None of them changes a release version or authorizes a merge/release.

Validation

• app:testDebugUnitTest passes
• app:assembleDebug passes
• native debug builds pass for arm64-v8a, armeabi-v7a, and x86_64

Not included

• the broader unpublished Node type-asset migration
• version bump, merge, or release