docs(architecture): fix volume-content diagram rendering

[HeyiSun]

The volume-content sequence diagram in docs/ARCHITECTURE.md fails to render on GitHub because the semicolon after BYOC teams is parsed as a statement separator. Escape it as #59; so the note displays as written.

Rendering before and after

Before (current main)

GitHub displays Unable to render rich display:

Parse error on line 12:
... for BYOC teams;<br/>SDK stores it and f
-----------------------^

After (updated file)

sequenceDiagram
    autonumber
    participant U as SDK
    participant API as API
    participant PG as PostgreSQL
    participant VC as volume-content API (belt)

    U->>API: POST /volumes (create) or GET /volumes/{id}
    API->>PG: persist / load volume row
    API->>API: mint JWT (aud = https://api.&lt;domain&gt;)<br/>resolve domain
    API-->>U: { volumeID, name, token, domain? }
    Note over U: domain is returned only for BYOC teams#59;<br/>SDK stores it and falls back to api.&lt;E2B_DOMAIN&gt; otherwise
    U->>VC: /volumecontent/{id}/... at api.&lt;domain&gt;<br/>Authorization: Bearer token
    VC->>VC: verify token (audience must match its own origin)
    VC-->>U: file content

Loading

Checked all six diagrams with Mermaid 11.17.2 and in GitHub's preview. git diff --check passes.

AI-assisted: yes.

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[HeyiSun]

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