Release OWD Sync 0.1.3 candidate

[msinclair25]

Outcome

Publish the direct-pairing OWD Sync package required by the first managed tester.

Changes

• update package, manifest, and compatibility map to 0.1.3
• add exactly one owd-pair protocol handler
• update README onboarding and source provenance
• retain the Apache license and upstream notices

Verification

• formatting, lint, typecheck, and 9 tests
• production build and bundle guard
• exact-tag 0.1.3 package rehearsal
• release archive checksum verification

Release gate

Keep this pull request in draft until the managed pilot Phase 9B and two-disposable-cell acceptance gates pass.