fix(cli): route timeline project directories to inspection

[user-github-me]

The documented hyperframes timeline <project-dir> command rejects every project path as an unknown subcommand after timeline editing subcommands were added. Users cannot inspect another project by its advertised positional directory argument.

Distinguish inspection paths from the existing edit verbs before Citty dispatches. Keep flags parsed and validated, preserve -- for literal directory names and edit arguments, and reject extra inspection arguments through the existing diagnostic helper.

Validation: five initial end-to-end regressions fail on main; final 131 related timeline, command-registration, and argument-validation tests pass. Seventeen built-CLI cases cover absolute/relative paths with spaces, flag order, current-directory inspection, subcommand/dash-prefixed directory names, separators, unknown flags, extra/missing directories, and unchanged edit plans. Repeated inspection output is stable and all input files remain unchanged. CLI build/typecheck, root lint, formatting, comment checks, and commit hooks passed.

[jrusso1020]

Thanks. This restores the documented hyperframes timeline <project-dir> form, which currently fails with "Unknown command" for any path. Flag validation and extra-argument checks still apply to inspection, and the -- handling for directories named like a verb is covered. One small trade-off: a mistyped verb now reports unexpected extra arguments rather than an unknown command. Heads up: this conflicts with #5279 in the timeline e2e test file, so whichever lands second needs a rebase.

— Rames