docs(sdk): use [subscribe]/[publish] tables, not [[interceptor]]/ipc_* arrays

[joshuajbouw]

astrid#863 makes the [publish]/[subscribe] tables the only IPC-intent surface (removes [[interceptor]] and the capabilities.ipc_* arrays).

• Doc comment (interceptors.ts) + README manifest snippet updated to the table form.
• examples/test-capsule/Capsule.toml migrated — it used both ipc_publish = [...] and a [[interceptor]] block, so it would have silently lost its binding/ACL under the new kernel (and is a copy-paste template). Now uses [publish] + a [subscribe] handler entry (wit = "opaque", since the test payloads are untyped).

SDK code is unaffected — it never parsed Capsule.toml.

[gemini-code-assist]

Code Review

This pull request updates the capsule configuration format by replacing the ipc_publish capability and [[interceptor]] array with the new [publish] and [subscribe] sections in Capsule.toml files and documentation. It also updates the contracts subproject commit and adjusts the documentation in astrid-sdk to reflect these changes. There are no review comments, and I have no feedback to provide.

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