fix(scripts): fall back to simple_yaml when PyYAML is absent during setup#81
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…etup bigpowers setup crashed on a stock python3 without PyYAML: srp-engine.py imported yaml at module load (ModuleNotFoundError), and validate-skill-yaml.py exited 2. Both now fall back to the dependency-free scripts/lib/simple_yaml.py. simple_yaml gains double-quoted-escape unescaping and folded/literal block scalar support so the PyYAML-free path is byte-identical to PyYAML across all skill frontmatter. Also corrects the misleading "targets.yaml missing" warning, which also fires when yq is absent. Adds scripts/test-setup-no-pyyaml.sh as a recurrence guard.
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## [2.77.2](v2.77.1...v2.77.2) (2026-07-19) ### Bug Fixes * **scripts:** fall back to simple_yaml when PyYAML is absent during setup ([#81](#81)) ([2608c64](2608c64))
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🎉 This PR is included in version 2.77.2 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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Summary
bigpowers setupcrashed on a stock macOSpython3without PyYAML (Issue #77).python-env.shdeliberately warns-and-continues without PyYAML, but two setup-path scripts hard-depended on it:scripts/lib/srp-engine.py—import yamlat module load →ModuleNotFoundError(the reported traceback).scripts/validate-skill-yaml.py—except ImportError: sys.exit(2), whichsync-post.shturns intosync-skills: FAIL. A second landmine reached only once the first is fixed.Fix
scripts/lib/simple_yaml.py(story e38s01) via a_load_yamlshim — chosen overpip install(PEP 668 externally-managed-environment fragility).simple_yaml.pygains double-quoted-escape unescaping and folded/literal block-scalar (>/|) support, so the PyYAML-free path is byte-identical to PyYAML across all skill frontmatter.scripts/sync-skills.sh— corrected the misleadingtargets.yaml missingwarning (it also fires whenyqis absent).scripts/test-setup-no-pyyaml.shrecurrence guard; bug SoT inspecs/bugs/.Test plan
srp-engineexit 1,validateexit 2); both now exit 0.sync-skills.shunder a no-PyYAML interpreter → exit 0, zero drift in generated.cursor/.gemini/.piartifacts.scripts/test-setup-no-pyyaml.sh→ 3/3 PASS (crash-free + fallback ≡ PyYAML for all skills).npm run compliancePASS · verification gates 11/11 ·trace-stories --strictexit 0.trace-matrixoutput (base vs modifiedsimple_yamlidentical).Closes #77