Register w3id.org redirects for communitymech CURIEs

[cmungall]

Summary

The schema declares communitymech: https://w3id.org/culturebot-ai/communitymech/ but this w3id is not registered, so CURIEs don't resolve.

Propose shortening to https://w3id.org/communitymech/ and registering it in perma-id/w3id.org.

Requirements

• https://w3id.org/communitymech/EcoFAB_Ring_Trial_SynCom17 → community entry
• https://w3id.org/communitymech/ → docs landing page
• Content negotiation (HTML vs YAML/JSON-LD) where feasible

Linked CURIEs from nmdc-sfas-brcs

CURIE	SFA/BRC
communitymech:EcoFAB_Ring_Trial_SynCom17	m-CAFEs
communitymech:ORNL_PMI_Populus_PD10_SynCom	PMI
communitymech:GLBRC_Populus_Variovorax_SynCom28	GLBRC
communitymech:ENIGMA_Denitrifying_SynCom	ENIGMA