feat(libsql): open existing authorities without writes

[0thernet]

Summary

Adds a read-only authority-open seam for separately held reader or purge custody.

• verifies the exact installed schema, contract, binding, head, and purge state
• rejects missing, purged, or differently bound spaces
• performs no data mutation while opening an existing authority
• documents and exports the new API as Oh v0.2.1

Why

A least-privilege purge worker must not need permission to create spaces or bindings merely to open its assigned working store.

Verification

• bun run check (139 tests, 1,480 assertions)
• packed package dry run and Node portability/projection probes
• site source, production build, and built-runtime probe
• regression wrapper rejects any space/binding INSERT during existing-only open

[vercel]

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Project	Deployment	Actions	Updated (UTC)
oh-computer	Ready	Preview	Aug 30, 2026 1:25am