feat(a2a): verify AP2 mandates before paid invocation - #4963
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The existing AP2 foundation signs/verifies mandates and records verification on completed tasks, but embedded paid tools could not inspect the authorization before acting. Assign stable task/context IDs before invocation and expose an immutable AP2FromContext snapshot to Invoke and StreamInvoke, including verification results under the existing explicit public-key option.
Focused handler tests cover a paid-tool boundary for normal and streaming requests: valid payment authorization proceeds, while tampered signatures, wrong x402 rail references and missing verification cannot execute the paid operation. Existing mandate, task continuation and streaming tests pass, as do the repository build and lint.
This completes the mandate foundation and focused paid-path integration. It does not execute real payments, add a settlement ledger, enforce application spend/replay policy or automatically forward trust across RPC; docs explain these boundaries.
Closes #4841.