Modernize for solid-apps conventions (xlogin, federation, ACL'd collab)

[melvincarvalho]

mindstr hasn't been pushed since Dec 2024. The live mindstr.org has moved on, and the solid-apps ecosystem has matured (xlogin, MCP, federation patterns). Now that mindstr is being added to the solid-apps productivity bundle, it should be brought up to current conventions.

To do

• Sync source with mindstr.org — push the live version to this repo's gh-pages branch so jss install pulls current code.
• xlogin integration — single widget for Solid OIDC + Nostr (did:nostr:), matching forum / chess / poker / charlie / chat.
• Federation: WebSocket subscribe — live multi-user editing on a shared mindmap via /.notifications, if not already there.
• Per-mindmap ACL — foaf:Agent Read + acl:AuthenticatedAgent Append for collaborative edit. Same shape as forum, chess, poker.
• README with install instructions — `jss install melvincarvalho/mindstr=mindstr` or bare `mindstr` if aliased under solid-apps.
• SKILL.md (optional) — agents could read/extend mindmaps via MCP.
• Consider moving under solid-apps org — so the bundle entry simplifies to bare mindstr.

Related

• solid-apps/bundles productivity.jsonld — mindstr just added
• solid-apps conventions: forum, chess, poker, charlie, chat all follow the same pattern
• JSS#490 — MCP capstone (for the SKILL.md angle)