feat(triggers): add per-agent JIRA issue-transitioned toggles and pm-trigger-set CLI

[aaight]

Summary

• Extend JIRA trigger config schema — issueTransitioned now supports both legacy boolean and a per-agent object ({ briefing, planning, implementation }) following the same union pattern as readyToProcessLabel
• Add resolveIssueTransitionedEnabled helper — resolves per-agent toggle with backward-compatible boolean fallback
• Update JIRA issue-transitioned trigger — checks per-agent toggle after resolving agentType in handle(); matches() continues using the "any agent enabled" check via resolveJiraTriggerEnabled
• Move JIRA toggle to per-agent dashboard sections — removed from SHARED_PM_TRIGGERS; added issueTransitioned.briefing/planning/implementation to each agent in AGENT_TRIGGER_MAP (dot-notation already supported by existing TriggerToggles component)
• New CLI command — cascade projects pm-trigger-set for managing Trello card-moved and JIRA issue-transitioned toggles per agent, following the review-trigger-set pattern
• CLAUDE.md — documented per-agent PM trigger modes and pm-trigger-set CLI command
• Tests — added schema, resolver, and trigger handler per-agent toggle tests (77 tests passing in the two affected test files)

Test plan

• Run npm test -- tests/unit/config/triggerConfig.test.ts tests/unit/triggers/jira-issue-transitioned.test.ts — all 77 tests pass
• Run npm run typecheck — zero errors
• Run npm run lint — zero errors
• Manual: Dashboard → Agent Configs: JIRA projects show per-agent "Issue Transitioned" toggles under briefing/planning/implementation; "Issue Transitioned" no longer appears in the Shared PM section
• Manual: cascade projects pm-trigger-set <project-id> --no-issue-transitioned-implementation disables the implementation agent's JIRA trigger without affecting briefing/planning
• Manual: cascade projects pm-trigger-set <project-id> --no-card-moved-to-briefing disables Trello card-moved for briefing

Card

https://trello.com/c/NLf1EhY5/85-briefing-planning-and-implementation-should-have-optional-toggles-exposed-in-dashboard-and-cli-for-triggering-on-moving-the-work

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[nhopeatall]

🔍 Reviewing PR...

[nhopeatall]

LGTM — Clean implementation that correctly mirrors the existing readyToProcessLabel union pattern for issueTransitioned. Schema default change (from z.boolean().default(true) to .optional()) is safe because both resolveJiraTriggerEnabled and resolveIssueTransitionedEnabled return true for undefined, preserving backward compatibility. The matches()/handle() split (any-agent check vs per-agent check) is consistent with the label-added trigger. CLI follows the review-trigger-set pattern. Dashboard mapping uses the existing dot-notation support. The projects.test.ts env-stubbing additions are a sensible drive-by fix.