Fix rename regressions: auto-update, version display, org after login

[kaghni]

Fixes

1. Auto-update broken — GITHUB_RAW_PKG still pointed to activeloopai/deeplake-claude-code-plugins, now activeloopai/hivemind
2. Update command wrong — deeplake-hivemind@deeplake-claude-code-plugins → hivemind@hivemind
3. Old branding — Deeplake Hivemind → Hivemind in all notices
4. Old command refs — /deeplake-hivemind:login → /hivemind:login in context injection
5. No version display when up to date — now shows ✅ Hivemind vX.Y.Z (up to date)
6. Org not shown after login — login.md now tells agent to include org name from output

[claude]

Claude finished @kaghni's task in 2m 2s —— View job

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No significant issues found. The rename/rebranding changes are applied consistently across both the source (src/hooks/session-start.ts) and the bundled output (claude-code/bundle/session-start.js).

One minor nit: package-lock.json still has "name": "deeplake-claude-code-plugins" (lines 2 and 8) while package.json now says "name": "hivemind". Running npm install would resync it, though this doesn't affect runtime behavior.