docs: update intentd architecture documentation

[wookiehangover]

Summary

• Audit the architecture document against the current daemon implementation, canonical protocol documentation, and frontend integration.
• Document all 17 workspace crates, their production dependency graph, daemon supervision, remote transports, subscriptions, workspace transfers, harness versioning, and voice transcription.
• Correct stale claims about service-module imports, transient events, search dependencies, ACP dependencies, and installed-daemon behavior.

Validation

• Compared every documented workspace crate and production dependency against Cargo metadata.
• Verified all 13 relative documentation links.
• Confirmed the documentation diff passes whitespace validation.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR refreshes the intentd architecture reference against the current daemon and protocol.

Changes:

• Updates the workspace crate inventory, responsibilities, and production dependency graph.
• Documents local/WSS transports, pairing, reverse RPC ownership, and loopback tunneling.
• Explains durable versus transient events and typed snapshot-plus-delta subscriptions.
• Adds installed-daemon supervision, update, and restart behavior for `intentd-sitter`.
• Describes SQLite state, CRDT note merging, workspace transfer, and versioned harness behavior.
• Documents daemon-owned voice transcription, provider credentials, and workspace vocabulary.

Technical Notes: The document now points readers to canonical protocol and harness documentation, corrects stale service/dependency claims, and preserves the daemon binary as the composition root.

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

docs/ARCHITECTURE.md:176 describes /tunnel as authenticated, but serve --insecure serves that endpoint over plain ws:// with TLS and bearer-token enforcement skipped. This leaves an absolute security claim that is false in the documented development mode.

Severity: low

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[augmentcode]

^{Deep Code Review Agent🐛}

Review completed with 0 suggestions.

_{Reviewed commit: 460fcec}