fix(cli): honor authored durations when listing compositions

[user-github-me]

hyperframes compositions ignores an inline root's data-duration: a declared 8-second composition with a 2-second child is listed as 2 seconds. External compositions have the opposite trim problem: a declared 2.5-second composition with a 7-second child is listed as 7 seconds. Invalid external declarations can also produce Infinity or accept numeric prefixes.

Use the existing shared duration reader and resolver for both listings. A valid authored duration wins; otherwise the command derives the duration from child ends and keeps its external script fallback.

Validation: seven regression cases fail on main; 88 CLI composition, metadata, and timeline tests passed. The built CLI lists all eight shipped example projects successfully. Engine/parser/CLI builds, CLI typecheck, repository lint, formatting, test reachability, and hooks passed.

[jrusso1020]

Thanks. hyperframes compositions ignored an inline root's declared duration and let child clips stretch an external composition past its declared trim, so the listing disagreed with what the runtime plays. Routing both paths through the shared duration reader and resolver fixes that and removes a duplicated parser. The invalid-value cases are well covered.

— Rames