[cleanup] Phase 1: Remove tracked binary artifacts (releases/, dist/ cleanup) #621

Summary

Remove ~430MB of tracked binary artifacts from the repository.

Actions

• Remove releases/ from git tracking (422MB of .app bundles, .tar.gz archives)
• Add .beads/ to .gitignore
• Clean stale assets in terraphim_server/dist/ (old JS bundles not referenced by current index.html)
• Add .gitignore patterns for bulmaswatch source files
• Remove disabled/backup CI files (*.disabled, *.backup, *.template)

Verification

• cargo build -p terraphim_server succeeds (rust-embed still finds assets)
• git count-objects -vH shows reduced pack size
• CI workflows unaffected

Impact

~430MB repo size reduction. Low risk.