cli: extract agent and admin commands from main.rs
Move agent handlers (consolidate, replay, digest, experience-mine,
fact-mine, knowledge-loop, apply-*) into cli/agent.rs.
Move admin handlers (init, fsck, dedup, bulk-rename, health,
daily-check, import, export) into cli/admin.rs.
Functions tightly coupled to Clap types (cmd_daemon, cmd_digest,
cmd_apply_agent, cmd_experience_mine) remain in main.rs.
main.rs: 3130 → 1586 lines (49% reduction).
Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>
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