Keep tool discovery consistent across catalog rebuilds

[RhysSullivan]

Concurrent tool rebuilds can leave tool rows and shared schema definitions from different generations. Track a generation, a manifest, and a rebuild ownership token per connection. Use guarded replacement, reject incomplete or mixed catalogs, and mark only affected connections for repair on the next read.

Add tools.describeAll() to return visible tools with self-contained input schemas, effective policy, and read-only metadata in a batched read. Toolkit visibility and policy resolution use the same prepared snapshot. This layer includes cloud migrations 0018–0020 and their generated snapshots; local and selfhost schemas receive the same fields.

Depends on the guarded replacement layer. On D1, concurrent writers can still leave a mixed persisted state; generation validation refuses to serve it and the next read repairs it.

Validation on this layer: 79 SDK/catalog/policy tests, six toolkit tests, and all 13 selected typecheck tasks passed. The MCP interface is in the next PR.

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