feat(channel): graph-rooted Channel model (named graphs)

[HexaField]

Summary

Marks the Channel model with @Model({ name: "Channel", graph: true }) so each channel instance's triples are stored in an isolated named graph within the perspective's Oxigraph store.

What This Enables

• Scoped queries: Querying a channel's data only scans its named graph, not the entire perspective
• Bulk deletion: Removing a channel deletes its entire named graph in one operation
• Subscription filtering: UI components subscribed to a specific channel's graph won't re-render when unrelated channels change

Change

- @Model({ name: "Channel" })
+ @Model({ name: "Channel", graph: true })

In packages/api/src/channel/index.ts.

Graph IRI Convention

Each channel instance gets a named graph at:

ad4m://graph/<channelBaseExpression>

All triples for that channel (name, description, views, members, etc.) are stored within this graph rather than the perspective's default graph.

Dependencies

• Requires: feat: Named Graphs Within Perspectives ad4m#812 (feat/subject-class-named-graphs) — the AD4M SDK/executor changes that implement the named graphs infrastructure

Testing

• TypeScript compilation passes (tsc --noEmit)
• Existing Flux tests unaffected (graph-rooted is backward-compatible — old data in default graph is still queryable)

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• Commit unit tests in branch feat/subject-class-named-graphs

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