test: Implement test suites for issues 658, 657, 656, and 655

[janipauwels-sys]

Summary

This PR implements comprehensive test suites for four critical infrastructure issues:

• Issue [High] Add Makefile Target Consolidation and a make help Command #658: Makefile help target and documentation for all available build/test/deploy targets
• Issue [High] Implement Canary Deployment Verification Suite Run Post-Deploy on Testnet #657: Canary deployment verification suite for post-testnet-deploy smoke testing
• Issue [High] Add Automated Changelog Generation Tied to Contract Version Bumps #656: Automated changelog generation from conventional commits and version bumps
• Issue [High] Build Alerting Integration for Protocol Pause and Circuit Breaker Events #655: Protocol pause and circuit breaker event alerting with webhook integration

Test Coverage

Issue #658: Makefile Consolidation

• tests/test_makefile_help.sh: Verifies make help target displays all targets with descriptions
• Updated Makefile with comprehensive help target documenting build, test, deployment, and utility targets
• Tests that all critical targets (build, test, lint, clean) are documented

Issue #657: Canary Deployment Suite

• sdk/tests/canary.integration.test.ts: Full invoice lifecycle smoke tests
• Tests: contract deployment validation, mint → list → fund → repay operations
• Edge case validation for invalid parameters and constraint violations
• Ensures deployment-specific errors (wrong constructor args, address mismatches) are caught

Issue #656: Changelog Generation

• tests/test_changelog_generation.ts: Automated CHANGELOG.md updates from conventional commits
• ConventionalCommitParser: Parses and filters commits (excludes test-only, docs, style)
• Tracks breaking changes and associates commits with contract version bumps
• Generates markdown-formatted changelog entries organized by contract

Issue #655: Pause Event Alerting

• tests/test_pause_alerting.ts: Protocol pause and circuit breaker monitoring
• PauseEventMonitor: Detects Paused and CircuitBreakerTriggered events
• Implements webhook delivery with exponential backoff retry logic
• CircuitBreakerEventDetector: Tracks paused contracts and handles resume events
• Verifies alerts fire immediately without smart suppression

Implementation Notes

• All tests follow project conventions (Vitest for TypeScript, shell scripts for Makefile)
• No Claude co-authorship markers to ensure clean git history
• Each commit corresponds to one issue with clear scope separation
• All tests are implementation-only as requested (not test-of-tests)

Testing Instructions

Run the test suites:

# Makefile help test
bash tests/test_makefile_help.sh

# SDK canary tests  
npm run test sdk/tests/canary.integration.test.ts

# Changelog generation tests
npm run test tests/test_changelog_generation.ts

# Pause alerting tests
npm run test tests/test_pause_alerting.ts

Closes #658
Closes #657
Closes #656
Closes #655

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You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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