feat: report which skill failed to install and why

[beeman]

A failed skill install previously only surfaced as Installed 1/2 skills, with the actual error hidden behind --verbose. This came up in solana-mobile-cli, where the react-kit-shadcn template's first skill (solana-foundation/solana-dev-skill) fails to install because its SKILL.md frontmatter has an unquoted description: containing : , which is invalid YAML — and there was no way to tell from the output.

The install-skills task now collects per-skill failures and always logs a warning per failed skill with the skill source, the first line of the skills CLI's stderr (e.g. the YAML parse error), and a pointer to the full error log written by execAndWait:

▲  Failed to install skill https://github.com/solana-foundation/solana-dev-skill: ⚠ Skipped …/SKILL.md — YAML parse error: Nested mappings are not allowed in compact mappings at line 2, column 14: (full log: …/skill-test-e2e.error.log)
◇  Installed 1/2 skills

Verified end-to-end with a built dist against gh:solana-mobile/templates/mobile/react-kit-shadcn. Tests updated: the failure test now asserts the always-on warning, and a new test covers reason extraction from CreateAppError.

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Latest commit: 50ae922

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commit: 50ae922

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no outstanding correctness, security, or repository-rule issues.

Summary

The PR improves best-effort skill installation diagnostics without changing its failure semantics.

• Collects each failed skill installation and emits an always-visible warning identifying the source.
• Extracts the first meaningful error line from CreateAppError and points users to the complete durable error log.
• Adds coverage for ordinary errors, structured command errors, partial success, and complete failure.

_{Reviews (2) · Last reviewed commit: "feat: report which skill failed to insta..."}

[beeman]

This should make it easier to spot issues like this solana-foundation/solana-dev-skill#74