fix(tests): repoint runner to backend_old/src + stamp the real package's ratios

[erinepshovel-code]

Why

Follow-up to #110. Two linked problems the first ratios pass surfaced:

1. The test runner pointed at the wrong path. The canonical edcmbone package (canon/CanonLoader, metrics/*, parser/, compress.py) was moved to backend_old/src/edcmbone/ during the layer migration, while backend/src/ now holds the new edcmbone_backend package. But tests/conftest.py and several test modules still located the package at backend/src/edcmbone. With it absent there, import edcmbone fell through to the incomplete repo-root copy → 4 modules errored at collection (the red test job on chore(ratios): stamp executable source with ratios bookend #110).
2. The real package was never ratios-stamped. chore(ratios): stamp executable source with ratios bookend #110 excluded backend_old/ as "legacy", so the package that's actually live got no ratios: bookend.

What

• Runner repair: repoint BACKEND_SRC and the per-test path constructions from backend/src → backend_old/src (8 test files incl. conftest.py). pytest now collects and passes 78/78 (was 4 collection errors).
• Ratios: stamp the strict single-line ratios: bookend on the 16 non-empty files of backend_old/src/edcmbone/. Values computed by skill-lib's ratios_check.py, so ratios_check --strict reports 0 drift / 0 misplaced. The empty canon/data/__init__.py marker is left unstamped.

Verification

• python -m pytest -q → 78 passed (before: 4 collection errors)
• ratios_check.py --root backend_old/src/edcmbone → 16 covered, 0 drift, 0 misplaced
• py_compile clean across the package

Note / out of scope

This makes the runner find the package where it currently lives; it does not rename backend_old/ back to a non-"old" location or reconcile CLAUDE.md (which still describes the package at backend/src/edcmbone). If backend_old is not the intended permanent home, that directory rename is a separate decision.

🤖 Generated with Claude Code

https://claude.ai/code/session_016MxbhVVRcSdqBTYuvyDR5L

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Generated by Claude Code

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the test suite to load the legacy backend_old/src implementation of edcmbone, and introduces auto-generated “ratios” annotations across multiple backend modules.

Changes:

• Repointed test path constants from backend/src to backend_old/src.
• Updated a docstring reference to match the new backend path.
• Added “# ratios: …” header/footer comments to many backend_old Python modules.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_ucns_objects.py	Switches UCNS object tests to import from backend_old/src.
tests/test_ucns_g_schema.py	Updates docstring path reference to backend_old/src.
tests/test_polarity_balance.py	Points word data fixture path at backend_old/src.
tests/test_metrics_layer_designation.py	Switches metrics-layer tests to backend_old/src.
tests/test_metric_orthogonality_v02.py	Switches orthogonality tests to backend_old/src.
tests/test_apostrophe_normalization_and_tokenization.py	Reads parser source from backend_old/src for regex extraction.
tests/test_affix_residual_validation.py	Updates sys.path insertion target to backend_old/src.
tests/conftest.py	Updates shared BACKEND_SRC and related comment to backend_old/src.
backend_old/src/edcmbone/ucns/ucns_v04.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/ucns/closed_tokens.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/ucns/init.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/parser/turns_rounds.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/parser/init.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/metrics/stats.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/metrics/risk.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/metrics/projection.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/metrics/orthogonality.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/metrics/matrix.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/metrics/compute.py	Adds “ratios” header/footer comments (and adjusts trailing whitespace around return).
backend_old/src/edcmbone/metrics/init.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/compress.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/canon/loader.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/canon/init.py	Adds “ratios” header/footer comments.
backend_old/src/edcmbone/init.py	Adds “ratios” header/footer comments.

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