Implement replay execution orchestration from scenario version or generation artefact

[kalen-releasedgroup]

Summary

Run approved scenarios or generated artefacts through Playwright in isolated execution contexts.

Scope

• Start replay runs from either a scenario version or generation artefact.
• Persist replay start/end state, environment, browser, and source metadata.
• Ensure replay execution uses isolated browser contexts by default.

Requirement Links

• FR-REP-001, FR-REP-005
• Sections 5.3.4, 12.6
• Acceptance Criterion 4

Dependencies

• Generation artefacts or approved scenario versions

Exit Criteria

• Replays can be launched from the UI.
• Replay source is traceable to scenario version or generated artefact.
• Replay contexts are isolated unless explicitly configured otherwise.