Enforce positional HRM triggers

[colonelpanic8]

Summary

• repin the positional hold-trigger and on-release Morse topics to their upstream-ready revisions
• remove the unconditional modifier exemption that allowed same-hand HRMs to activate each other
• record that unsafe branch as intentionally superseded
• preserve the preceding ephemeral split-layer-state entry

The generated 23-entry stack reproduces exactly at tree a140ed730dc0d993dcb2311c786c54cf954fec1a.

Upstream implementation: rmk-rs/rmk#1037

Verification

• fork-assembler build
• fork-assembler build --locked
• downstream Glove80 left and right firmware builds