RackForce v0.2.0-beta

9 commits of new work since v0.1.2-beta, rebuilt and verified (2370+ assertions, all green; armhf clean):

• Musicality pass — velocity accents, deterministic humanization, phrase-aware Gen (chord-tone bias, motif repeats, phrase-end rests), fixed ChordSeq voice-leading, per-drum note config on DrumSeq/Grids.
• Two new routing modules — midi_in (live Force pads/keys into a chain) and a named internal note bus (bus_send/bus_in) to fan one lane's output into several others.
• Live config edits — changing genre/scale/grid/key mid-playback now applies in place instead of rebuilding the engine (no more all-notes-off panic + transport restart).
• Step editor rebuilt Elektron/Opal-style — paged (Trig/Vel/Prob/Gate/Ratchet/Nudge/Mod), mouse-drag painting.
• Drum styles fixed + expanded to 23 genres (house/boombap were silently missing from the picker).
• Key/root picker on Gen, Marbles, Markov, Turing.
• Honest publisher/follower harmony badge in the web UI.

README rewritten to be shorter and cover all 20 module types.