Support streaming agent methods in generated guest bridges

[vigoo]

Summary

Implement generated guest bridges for stream-bearing agent methods in Rust, TypeScript, Scala, and MoonBit. Components can use generated clients to invoke streaming methods through awaited Wasm-RPC without handwritten transport code.

• Generate native AgentStream signatures, recursive stream-aware codecs, and schema-specific producer factories/adapters. Support nested streams, dynamically shaped values, and multiple sibling streams without fixed positional slots.
• Preserve affine endpoint ownership and direct unread forwarding, with cleanup for partial conversion failures, aborted calls, and failed invocation starts. Omit triggered and scheduled variants for stream-bearing methods while preserving non-streaming and external bridge behavior.
• Fix runtime defects exposed by cross-component tests: attachment slots colliding across consumers, loopback handles incorrectly entering foreign attachment control, local nested streams stalling on an attachment they cannot acquire, queued child drains being lost after parent completion, and unread resource drops failing to notify producers. Root production remains attachment-gated; nested production is admitted after its introducing parent item is committed.
• Add shared generator fixtures, generated-client compilation and codec tests, and language-specific cross-component lifecycle E2Es. Wire the suites into the guest-bridge CI shard, document the contract, and provision the required guest toolchains in orb setup.

Resolves GOL-511

Validation

• Rust formatting checks and git diff --check passed.
• cargo clippy -p golem-cli -p golem-worker-executor --all-targets --no-deps -- -D warnings passed.
• CLI generator unit tests: 57 passed.
• Durable session/stream runtime unit tests: 84 passed.
• Combined Rust, TypeScript, and MoonBit generated-client matrix: 4 passed, including executed schema-specific codec checks; Scala generated-client compilation also passed.
• Cross-component E2Es passed in all four languages, including input/output streaming, direct forwarding and loopback, recursive/dynamic siblings, stream-of-stream values, producer failures, cancellation/readable drop, and backpressure coverage. All 5 TypeScript E2Es passed together against the updated runtime.
• SDK validation included Rust 131 passed / 4 ignored, TypeScript 738 passed / 20 skipped, MoonBit 54 passed, and Scala core 608 passed plus targeted native stream tests. TypeScript and Scala guest runtime artifacts were rebuilt for runtime testing.
• Focused Oracle reviews informed codec ownership, abort cleanup, and runtime admission/attachment decisions. Bounded bug reviews finished with no actionable findings.

Full repository CI and multi-executor deployment testing were not run locally.

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