Channel tags, stems, master chain, FM, K envelope, slide, UDP control, reconnect

Grid grammar:
- a base-36 glyph above a column's top operator tags it with a MIDI channel;
  '>' right of the tag makes the channel mono-legato (60 ms slide)
- operators below a '!' form the stereo master chain: Z delay, W chorus,
  plus any filter/shaper
- X: phase modulation by the cell to the left (and above), index from the right
- K: control envelope; left of an operator it drives that operator's left
  param (2KL5 = 303 filter sweep)
- per-note params: @ velocity, ^ key tracking, ? random; registers now read
  on the digit scale, so MIDI CC and UDP registers have full range

I/O:
- MIDI keeps the channel nibble
- UDP (orca's ';', port 49161): k7 register, *3 bang a column, @34O write
  a glyph, #name load a patch
- --stems n: one mono PipeWire node per channel tag (galdr.ch<tag>),
  sample-aligned with the master; separate nodes because a playback
  stream's AUX ports deliver no data in PipeWire 1.6
- the audio thread reconnects when PipeWire restarts; status line shows it
- patches: ~/hometaping/<date>.galdr by default, .galdr extension, Ctrl+S,
  GALDR_DEBUG=<file> logs events

Examples with render tests: drums, orchestra, acid.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

examples/drums.galdr

@@ -0,0 +1,7 @@
+# bass (ch 1) | kick (ch 10) | snare (ch 11) | hats (ch 12): one drum per MIDI channel
+.0..9....a...b.
+.A..O9...N...N.
+@L5.EX9.6B5.8H.
+.E2..E1..E1..E0
+2S...!..3S...!.
+.!.......!.....