Refactor: thin lib.rs — CLI schema and run only

[jon-devlapaz]

Summary

src/lib.rs (~490 lines) mixes clap schema, dispatch, and per-command stdout/stderr narrative. Keep the edge thin: parse + route; move report printing next to command modules.

Why

Debt ledger still pins behavior characterization on lib.rs / command paths. Narrative coupled to dispatch makes command extraction and testing noisier than necessary.

Design target

• lib.rs: Cli, Command, SkillCommand, run / thin dispatch
• Each command module owns print_* / success lines (pattern already started: update::print_report, harvest reports in lib today)
• Shared chrome stays in style

Acceptance

• Snapshot/acceptance stdout contracts unchanged
• lib.rs materially smaller; no new abstractions beyond relocating reports
• Still one public run(cli, cwd) entry for the binary and tests

Priority

Low–medium hygiene; do not block bug fixes #24–#26.