Init: preserve repository config in easy mode

[jeffhuber]

Problem and behavior

In a configured repository, code-mower init --easy previously selected packaged starter defaults and could stage them beside the repository's own code-mower.yml. It now detects and uses the root config for both preview and apply. An implicit packaged-starter apply beside a root config fails with exact safe commands; --packaged-starter remains the explicit opt-in.

The generated plan also emits each selected lane config once. Claude and Codex lane configs now use the same package-backed selected-lane path as other local lanes, eliminating the duplicate-path collision while keeping setup-drift source/target naming unchanged.

Closes #1054.

Validation

• PYTHONPATH=src /private/tmp/code-mower-v151-venv/bin/python -m pytest -q tests/test_safe_init_1054.py tests/test_adoption_diagnostics.py tests/test_init_builders_cold_start.py tests/test_adoption_polish_1015.py tests/test_init_actionlint.py tests/test_init_build_loop.py — 134 passed, 76 subtests passed
• PYTHONPATH=src /private/tmp/code-mower-v151-venv/bin/python -m pytest -q tests/test_release_hygiene.py — 363 passed, 945 subtests passed
• PYTHONPATH=src /private/tmp/code-mower-v151-venv/bin/python scripts/smoke_easy_mode.py — passed
• ruff check src/code_mower/init.py tests/test_safe_init_1054.py — passed
• ruff format --check tests/test_safe_init_1054.py — passed
• git diff --check — passed

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Code Review ✅ Approved

🟡 Medium risk

Preserves repository config in easy mode by detecting and using the root code-mower.yml for both preview and apply, eliminating duplicate lane config paths while maintaining setup-drift naming. All tests pass and no issues found.

Review coverage

Rules No rules evaluated

Functional validation Not enabled · Set up

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[github-actions]

Claude audit (merge-authority lane)

Head SHA: cb823d9c61278ae1fd9d7631b6485dbb3544b304
Verdict: BLOCKED
Review details remain in the local audit artifact.
Publication workflow: .github/workflows/local-audit-publication.yml at ba72ac986ab3d24e1c5ace2fbcdcc9e4aed97aaa

[jeffhuber]

Resolved the exact-head Claude P2 on the same branch at 8006a7614f2943774a084a4eef94c7bb61e8f134.

The real-file lane-config de-duplication is now limited to Claude and Codex, the only modules previously duplicated through PRODUCT_SUPPORT_FILES. Other local/research lanes retain their established placeholder behavior. A new cli_research regression applies the generated plan and proves every selected research lane remains a placeholder.

Validation after the fix: 8 focused #1054 tests, 127 related init/adoption tests plus 76 subtests, Ruff, and diff check passed. A fresh exact-head Claude audit is requested; prior evidence remains bound to the old head.

[github-actions]

Claude audit (merge-authority lane)

Head SHA: ef981e63d6ea4a17b6b1da29acc55c7699dcb45c
Verdict: PASS
Review details remain in the local audit artifact.
Publication workflow: .github/workflows/local-audit-publication.yml at e070308b4affce566ef3adb8c8b7a706286994da