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Trevin Chow 7f6c3b51d8 docs(solutions): capture the expected-absence-vs-error CLI lesson
Extends Principle 4 of the agent-friendly-CLI rubric with the case behind
#1607: a "not found" path that serves both a genuine read error and a caller
correctly discovering there is nothing there, and the follow-on trap that
splitting one error into several outcomes re-creates the conflation whenever a
branch borrows another's exit code.

Adds `Clean skip` to CONCEPTS.md — the outcome class the whole distinction
turns on. Quotes the doc's pre-existing unquoted `title:` so its frontmatter
parses under strict YAML.

Claude-Session: https://claude.ai/code/session_01WJEpxdL3bLKCj2EHyZZe8V
2026-09-01 10:53:49 -07:00
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