nx_raci_bind.nx

nx_raci_bind.nx -- bind the conductor + race team into the RACI SOVEREIGNLY (no TSV). The contract nx_raci reads is still nishi_raci.tsv (legacy); rather than perpetuate it, this writes a sovereign RACI EXTENSION as rows in the roles- seg-store channel "raciext" (role<TAB>activity<TAB>letters), formalizing the two roles' REAL duties: conductor is Accountable for `orchestrate` (it keeps the beat / liveness), race is Accountable for `benchmark` (competitive measurement). Then it CUES each (PENDING activation in its channel) so the section is playing. IDEMPOTENT: adds a role only if the extension does not already list it; cues only an empty channel. nx_team_harmony reads this extension for BOUND/OWNS, so the two sections can reach harmony without a single TSV write. Sovereign. license_tier: ORIGINAL