Adds a TypeScript adapter under integrations/aws-strands/typescript that
mirrors the existing Python adapter as much as possible.

Provides:
- StrandsAgent wrapping a Strands Agent or multi-agent orchestrator
  (Graph/Swarm) and translating its streaming events into AG-UI events
  (text, reasoning, tool calls, tool results, state snapshots, messages
  snapshots, multi-agent steps, custom events).
- StrandsAgentConfig / ToolBehavior with camelCase equivalents of every
  Python hook (stateFromArgs, stateFromResult, customResultHandler,
  argsStreamer, predictState, sessionManagerProvider, ...).
- Express transport via addStrandsExpressEndpoint + createStrandsApp,
  plus addPing and addCapabilities for health + advertised-event matrix.
- Eight runnable examples matching the Python server (agentic-chat,
  agentic-chat-reasoning, agentic-chat-multimodal, backend-tool-rendering,
  shared-state, agentic-generative-ui, human-in-the-loop) plus a TS-only
  tool-based-generative-ui example, and a dojo server that mounts all
  eight at the Python reference paths.
- Injectable Logger (config.logger) with Python-parity debug traces.

Native interrupt bridge (Strands SDK 1.1.0+):
- AgentResult.stopReason === "interrupt" emits RUN_FINISHED with
  outcome.type "interrupt" and the outstanding interrupts; IDs are
  recorded per thread.
- RunAgentInput.resume[] is validated against pending IDs (interrupts.mdx
  rule 4) and converted into Strands InterruptResponseContent[] forwarded
  as the stream args. Unknown IDs short-circuit with UNKNOWN_INTERRUPT.

Key differences vs. the Python adapter:

SDK-forced (behavior unchanged):
- Typed .type dispatch instead of Python's dict-key matching.
- AgentConfig.messages seeding at construction time vs. Python's in-place
  self.messages mutation; drives a separate buildStrandsSeed helper.
- Hardcoded TemplateAgentCloneFields in place of Python's
  inspect.signature introspection of StrandsAgentCore.__init__.

Additive (TS-only, close conformance gaps or match TS ecosystem):
- Multi-agent orchestrator mode for Strands Graph/Swarm.
- THREAD_BUSY guard for concurrent runs on the same thread.
- AbortController wired into Strands cancelSignal so client disconnects
  cancel the underlying stream.
- Native Strands interrupt bridge (above).
- HTTP-edge request validation (415 / 400) via the shared Zod
  RunAgentInputSchema, with snake_case -> camelCase key normalization.
- HTTP/1.1 + HTTP/2 disconnect handling that fires iterator.return() so
  the generator's finally runs (releases THREAD_BUSY slot, aborts stream).
- Explicit protobuf content negotiation (no binary frames for Accept: */*).
- GET /capabilities endpoint advertising supported events/features.
- emitChunkEvents collapsing *_START/*_CONTENT/*_END triples into
  self-expanding TEXT/TOOL_CALL/REASONING chunks.
- ToolCallContextExtras exposing context[] + forwardedProps on every
  hook context and stateContextBuilder.

Dojo wiring:
- aws-strands-typescript entry in agents.ts, menu.ts, env.ts, the prep/run
  scripts, and the dojo-e2e.yml CI matrix (port 8022).
- Feature list is a strict superset of the Python sibling: agentic_chat,
  agentic_chat_reasoning, agentic_chat_multimodal, v1_agentic_chat,
  backend_tool_rendering, agentic_generative_ui, shared_state,
  human_in_the_loop, tool_based_generative_ui.

Closes ag-ui-protocol#1680