Carry MCP tool _meta through to the persisted catalog

[RhysSullivan]

Fixes #1683

The MCP spec reserves _meta on Tool, but the plugin decoded each tools/list entry with a closed struct that did not declare the field, so it was dropped before the manifest entry was built. The listed-tool decode now declares _meta, the manifest entry carries it, and toToolDef stamps it into the mcp envelope already persisted in each tool row's annotations — Executor's own Tool has no _meta field, so a host reads it back from annotations.mcp._meta. The stamp schema declares it too, so it is not stripped again when a row is read at invoke time.

The map stays opaque; nothing interprets it and it never reaches the model. Because it is server-controlled, it is decoded permissively: a _meta that is not the spec's map shape is ignored for that tool rather than failing the whole-list decode and dropping every tool.

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commit: 3c974d0