fix: scope presenter bridge sessions

[Brad-Edwards]

Summary

Scope presenter BroadcastChannel traffic to one ephemeral workbench session so independent same-origin presentations do not drive each other. Prompter popout URLs now carry the same session scope through the existing URL bootstrap path.

Requirement UIDs

• (none - bug/refactor/maintenance run; see Traceability section below)

Related Issues

Closes #151

ADR Impact

• None

Changes

• Add presenter session id helpers and derive scoped presenter channel names in src/system/presenter/bridge.ts.
• Pass the resolved presenter session id from src/main.ts into the bridge bootstrap.
• Carry the presenter session scope into prompter popout URLs through URLSearchParams while preserving same-origin and opener isolation.
• Keep raw presenter command payloads and isPresenterCommand() validation in place.
• Add regression tests for same-session delivery, cross-session isolation, scoped-channel command validation, popout scope propagation, and session edge branches.
• Add a fixed changelog fragment.

Test Plan

• pnpm vitest run tests/system/presenter-bridge.test.ts tests/system/prompter-window-url.test.ts
• pnpm vitest run tests/runtime/screenshot-determinism-source.test.ts
• pnpm test:coverage -- tests/system/presenter-bridge.test.ts tests/system/prompter-window-url.test.ts
• pnpm lint
• pnpm typecheck
• pnpm test
• pre-commit run --all-files
• CI passed on PR fix: scope presenter bridge sessions #158
• SonarCloud checks passed on PR fix: scope presenter bridge sessions #158

Codex pre-push review was clean. Test-quality pre-push review was clean.

Ground Control Checks

• Implementation plan posted
• Completion gate passed
• Codex review clean
• Test-quality review clean
• CI green
• SonarCloud quality gate OK

Traceability

• IMPLEMENTS: issue Scope presenter BroadcastChannel traffic to one workbench session #151 <- src/system/presenter/bridge.ts, src/system/presenter/prompter-window.ts, src/main.ts
• TESTS: issue Scope presenter BroadcastChannel traffic to one workbench session #151 <- tests/system/presenter-bridge.test.ts, tests/system/prompter-window-url.test.ts

Checklist

• Changelog fragment added at changelog.d/151.fixed.md
• Issue Scope presenter BroadcastChannel traffic to one workbench session #151 closed
• in-progress label removed

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
95.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud