chore(schema): sync proof bundle schema

[andymolecule]

Summary

• sync the vendored proof-bundle canonical schema to Agora main's provider-boundary cleanup
• update the proof-bundle schema sidecar hash to d965627b6e3bac9fb4ebd7fec22ced623bdf64dcfce472aec1283761984226db

Verification

• npm ci
• AGORA_MAIN_RUNTIME_MANIFEST_SCHEMA_PATH=/tmp/agora-agent-worktrees/issue-1028-tighten-measurement-provenance-provider-adapter-boundary/packages/common/src/schemas/scorer-runtime-manifest.canonical.schema.json AGORA_MAIN_PROOF_BUNDLE_SCHEMA_PATH=/tmp/agora-agent-worktrees/issue-1028-tighten-measurement-provenance-provider-adapter-boundary/packages/common/src/schemas/proof-bundle.canonical.schema.json npm run check:agora-main-schema-sync
• npm test
• npm run check:replay-boundary && npm run check:release-provenance
• AGORA_SCORER_REPO_ROOT=/tmp/agora-scorers-issue-1028 pnpm runtime-schema:verify-cross-repo from the paired Agora worktree

Paired with moleculeprotocol/Agora#1028 provider-boundary tightening.