feat: register TrailerService in DI container (GIT-65)

[TonyCasey]

Summary

• Adds trailerService: ITrailerService to ICradle type definition
• Registers TrailerService as a singleton in the awilix container
• Adds 2 unit tests verifying resolution and singleton behavior

Closes GIT-65

Test plan

• npm run pre-commit passes (type-check + lint)
• All 270 unit tests pass
• New tests verify trailerService resolves with correct interface
• New tests verify singleton behavior

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Enhanced service architecture by registering a new trailer service in the dependency injection container. Added corresponding type definitions and test coverage to ensure proper service initialization and functionality.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Added TrailerService to the dependency injection container as a singleton with corresponding interface types and tests. The service exposes three methods: readTrailers, formatTrailers, and queryTrailers. Updates the ICradle interface to include trailerService.

Changes

Cohort / File(s)	Summary
DI Container Registration src/infrastructure/di/container.ts, src/infrastructure/di/types.ts	Registered TrailerService in the DI container as a singleton and added trailerService property to the ICradle interface with ITrailerService type.
DI Container Tests tests/unit/infrastructure/di/container.test.ts	Added tests verifying trailerService is properly exposed in the resolved cradle, exposes readTrailers, formatTrailers, and queryTrailers methods, and maintains singleton behavior.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title clearly and concisely summarizes the main change: registering TrailerService in the DI container, which is the core objective of the changeset.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch git-65

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[Copilot]

Pull request overview

This PR registers the TrailerService in the Awilix dependency injection container to enable automatic dependency resolution throughout the application. The TrailerService handles reading and writing AI-* commit trailers via git CLI, and this registration makes it available as a singleton dependency.

Changes:

• Added trailerService: ITrailerService to the ICradle type definition with proper import
• Registered TrailerService as a singleton in the DI container using asClass().singleton()
• Added comprehensive unit tests verifying service resolution and singleton behavior

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/infrastructure/di/types.ts	Adds ITrailerService import and trailerService property to ICradle interface
src/infrastructure/di/container.ts	Imports TrailerService and registers it as a singleton in the Infrastructure section
tests/unit/infrastructure/di/container.test.ts	Adds trailerService to core services check and adds dedicated tests for interface and singleton behavior

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