docs(rules): add live-reload guidance for the running Emacs daemon

Adds claude-rules/emacs.md documenting how to push a module edit into the long-running emacs daemon via emacsclient instead of restarting and re-opening files. Covers the reliable case (function redefinition), the caveats that bite (defvar defaults don't re-apply, use-package :config re-runs, faces need re-applying, baked or rendered state like the dashboard buffer must be regenerated), and the reload-and-verify loop. Captured after a long dashboard session where a stale buffer repeatedly masked working code.

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