fix(pm): tolerate optional-only build failures

[colinhacks]

Summary

• Continue an install when an approved lifecycle script fails for a package reachable only through optional dependency edges.
• Derive optionality from the dependency graph so frozen npm, Bun, and Yarn lockfiles behave the same as fresh resolutions.
• Keep failures fatal when the package has any required path, and report skipped builds through WARN_NUB_OPTIONAL_BUILD_FAILED.

Verification

• XDG_CONFIG_HOME=$(mktemp -d) make verify
• cd vendor/aube && cargo test -p aube --test e2e
• Built target/fast/nub and verified both optional-only and required sibling builds in a clean fixture.
• Installed and approved @bahmutov/add-typescript-to-cypress@2.1.2 in a clean hoisted consumer fixture; the published postinstall created both Cypress plugin files.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nub	Ready	Preview	Aug 12, 2026 5:33pm