Release 0.18.0: Test reorganization and job naming improvements

Summary

This release reorganizes the test suite to use hspec-like naming conventions and implements consistent job naming with prefixes across all GitLab CI jobs.

Test Suite Reorganization

• Reorganized tests with hspec-like naming: it-<does-something>
• Added positive tests for all validators (previously only had negative tests)
• Implemented expect-failure meta-test infrastructure for negative tests
• Auto-discovery of child pipelines from test directory
• Cleaned up test directory structure

Job Naming Improvements

• Implemented consistent job naming with prefixes:
  • build: for build jobs
  • publish: for publish jobs (cachix)
  • validate: for validation jobs (flake-lock, flake-show, flake-strict-inputs)
  • test: for test jobs (canaries, child pipelines)
  • generate: for generation jobs
  • aggregate: for aggregation jobs
• Updated remote/gitlab-ci.yml to use colon-based naming convention

Module Improvements

• Made child-pipeline module path-agnostic (no hardcoded "test" assumptions)
• Updated module test to use canaries instead of cachix for better coverage
• Added lib.findFlakes function for recursive flake discovery

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