test: coverage-driven hardening pass — detector matrix, unit tests, node/python parity gate

[kunalsuri]

Grows the smoke suite from 246 to 327 checks and lifts measured Node
installer coverage from 78.6% to 85.8% lines (66.6% to 76.4% branches):

• table-driven orient detector tests for every supported stack (Gradle,
  Go, Rust, Ruby, PHP, CMake, Makefile fallback + suppression, pip,
  yarn/bun/Pipenv locks, Turborepo, build-script-less and malformed
  package.json, empty repo, multi-stack note), flag overrides, and README
  description-extraction edge cases — orient.mjs is now at 100% lines
• per-ecosystem indepth dependency-parsing tests (pip, Poetry, Go, Cargo,
  Bundler, Composer) and a real-git-repo fixture for the git-history
  analyzer, both runtimes
• unit tests for classifyAction pinning the full re-run matrix, including
  the kit-upgrade "update" outcome that end-to-end tests cannot reach,
  and for the intake wizard's detectBranch (exported for testing)
• verify edge cases (no docs, duplicate basenames) and CLI surface checks
• a node<->python parity test: both installers must write identical
  orient profiles (minus timestamp) for the same fixture
• npm run coverage (c8 via npx) plus a CI coverage job enforcing a floor

Fixes the one divergence the parity test caught: lib/orient.py recorded
fork evidence with an ASCII '->' where the Node installer writes '→'.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01483R5qNvQeZ78kE52kGLHy

[Copilot]

Pull request overview

This PR strengthens the project’s installer smoke suite and adds coverage/consistency gates, with the goal of making stack detection and cross-runtime behavior (Node vs Python) harder to regress.

Changes:

• Expands test/run-tests.mjs with table-driven orient detector coverage, per-ecosystem indepth dependency parsing checks, verify edge cases, git-history fixture coverage, and unit-level pinning for classifyAction + detectBranch.
• Adds a Node coverage entrypoint (npm run coverage) and a CI coverage-floor job using c8.
• Enforces Node↔Python parity for orient output (minus timestamp) and fixes the one detected divergence in Python fork-evidence formatting.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/run-tests.mjs	Adds bare-fixture helper plus extensive new smoke/unit/parity test coverage across orient, indepth, verify, CLI surface, and git-history analysis.
test/README.md	Documents the new npm run coverage workflow and what it measures/enforces.
package.json	Adds coverage script running run-tests.mjs under c8 instrumentation.
lib/orient.py	Aligns fork evidence string formatting with Node (→) to satisfy parity.
lib/intake.mjs	Exports detectBranch (annotated as internal) to enable direct unit testing.
CHANGELOG.md	Records the coverage-driven hardening work and the parity-driven fix.
ai/guide/MODULE_MAP.md	Updates the “Last verified” baseline metadata text.
ai/analysis/audit-reports/DRIFT_REPORT.md	Updates committed drift report content (removes the stale-check note line for this snapshot).
.github/workflows/test.yml	Adds a dedicated coverage job enforcing c8 coverage floors for the Node installer.

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