feat(triggers): onCreate/onMove params for pm:status-changed

[zbigniewsobiecki]

Summary

Follow-up on top of #1141. Makes the create-path firing that #1141 added for Linear/JIRA independently configurable per agent, and preserves pre-#1141 behavior as the default.

Two new boolean params on pm:status-changed

Param	YAML default	Semantics
onMove	true	Fire when a work item is moved into a configured status.
onCreate	false	Fire when a work item is created directly in a configured status.

Defaults by provider (preserved)

• Linear & JIRA — default onCreate: false. Users who want the create-path fire agents must opt in via dashboard checkbox or cascade projects trigger-set --params '{"onCreate":true}'. This preserves pre-feat(triggers): support PM triggers for work items created directly in a triggering status #1141 behavior.
• Trello — historical behavior was fire-on-both. Migration 0050 backfills {onCreate: true, onMove: true} into every existing Trello project's enabled pm:status-changed row. Idempotent, preserves user-set keys via JSONB || operator.

Zero UI / CLI code

Rides on the existing declarative trigger-param pipeline:

• TriggerParameterInput already renders type: boolean params as checkboxes (web).
• cascade projects trigger-set --params already accepts flat primitive JSON.
• cascade projects trigger-discover auto-prints the new params from YAML.

Review-addressed issues from PR #1141

1. Silent behavior change → now explicitly configurable, with provider-aware defaults preserved via migration.
2. matches() asymmetry → create path now pre-filters on status presence (Linear: data.stateId; JIRA: issue.fields.status.name), mirroring update path.
3. Lost fromStatus log → restored on JIRA update path; explicitly omitted on create path (no from).
4. Test helper smell → JIRA buildCtx ternary de-duplicated; the redundant manual issue override dropped.
5. Handler complexity → extracted resolveAgentType and shouldFireOnEvent helpers to keep biome's cognitive-complexity warnings at bay.

Shape of changes

• src/agents/definitions/{splitting,planning,implementation,backlog-manager}.yaml — add onCreate + onMove params to each pm:status-changed entry.
• src/triggers/{linear,jira,trello}/status-changed.ts — switch to checkTriggerEnabledWithParams, gate create/move branches on params, tighten create matches().
• src/db/migrations/0050_trello_status_changed_on_create_backfill.sql — backfill existing Trello projects.
• tests/unit/triggers/{linear,jira,status,merged}-status-changed.test.ts — matrix tests for (onCreate × onMove) × (create × move).
• tests/integration/db/trelloStatusChangedBackfill.test.ts — 7 tests exercising the migration (Trello backfill, Linear/JIRA untouched, idempotent, preserves user-set keys).

Test run

• Unit: 7914 / 7914 passing
• Integration: 531 / 531 passing (including 7 new backfill tests)
• Lint + typecheck: clean

Test plan

• CI green (unit + integration + lint + typecheck + CodeQL)
• Merge feat(triggers): support PM triggers for work items created directly in a triggering status #1141 first, then retarget this PR to `dev` (GitHub auto-retargets when the base branch is deleted).
• After both merge: manual smoke in a Trello project (old behavior preserved) and a Linear project with onCreate toggled on (new behavior works).

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 97.34513% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/triggers/jira/status-changed.ts	94.00%	3 Missing ⚠️

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