Ports the emacs channel skill to match the other channel skills:
copy src/channels/emacs.ts + emacs/nanoclaw.el from the channels branch,
append the self-registration import, enable via EMACS_ENABLED, and wire
through the register setup step. Documents the v2 entity model (single
messaging group, platform_id="default") and drops the v1 auto-register /
symlink behavior that the old adapter did.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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