fix: use catch-all handler for merge_test_to_main action

[sweetmantech]

Summary

• Chat SDK's onAction with a string argument uses exact match, not prefix match
• merge_test_to_main:recoupable/api was not matching merge_test_to_main:
• Changed to catch-all handler pattern (same as onMergeAction) that uses startsWith() internally

Test plan

• Unit tests pass
• Update Slack interactivity URL to preview deployment
• Click "Merge test → main" button in Slack and verify it works

🤖 Generated with Claude Code

Summary by CodeRabbit

• Refactor
  • Improved internal code structure for the merge test to main action handler to enhance maintainability.

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Project	Deployment	Actions	Updated (UTC)
recoup-api	Ready	Preview	Mar 10, 2026 4:01pm

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 96f4390a-3b15-41db-b936-77a59a52b96e

📥 Commits

Reviewing files that changed from the base of the PR and between ff15919 and 6cba9b2.

⛔ Files ignored due to path filters (1)

• lib/coding-agent/__tests__/onMergeTestToMainAction.test.ts is excluded by !**/*.test.*, !**/__tests__/** and included by lib/**

📒 Files selected for processing (1)

• lib/coding-agent/handlers/onMergeTestToMainAction.ts

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📝 Walkthrough

Walkthrough

The PR refactors the action handler registration in the merge-test-to-main handler from an explicit action name filter to a generic action handler with an inline runtime guard that filters based on the action ID prefix. The core merge logic remains unchanged.

Changes

Cohort / File(s)	Summary
Handler Registration Pattern lib/coding-agent/handlers/onMergeTestToMainAction.ts	Changed from explicit action name filtering to a generic onAction handler with a runtime guard checking event.actionId prefix. Processing logic for parsing, repository extraction, token validation, and merge operations remains unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• agent: @U0AJM7X8FBR Slack Action: Merge test to main in the slack client in the #279: Added the original onMergeTestToMainAction handler with merge logic that this PR now refactors at the dispatch/registration layer.

Poem

A handler finds new clothes to wear,
From named to generic, stripped to bare,
The guard stands watch with keen intent,
Same logic flows, but elegantly bent. 🎭✨

🚥 Pre-merge checks | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Solid & Clean Code	⚠️ Warning	Handlers onMergeAction and onMergeTestToMainAction are nearly identical (23 lines each), violating DRY principle. Common logic should be abstracted into a reusable factory function parameterized by action prefix.	Extract common merge action handler logic into a factory function createMergeActionHandler(prefix: string) and move hardcoded action prefixes into named constants.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/merge-test-to-main-action-handler

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