Generated Node SDK contract markers and devdock example

[kvz]

Experimental Status

Experimental work: this PR is part of the API2 contract/generated SDK effort and is intentionally kept as a Draft while the generated surface is validated.

Why

API2 now generates TypeScript SDK endpoint and feature methods from contract data. This companion PR gives that generator real Node SDK marker regions to rewrite and compare, plus a checked-in example that proves the generated surface works as consumer code against devdock.

What changed

• The checked-in TUS Assembly example now reads createTusAssembly input from generic scenario.preparations[] instead of the removed API2 compatibility field.
• Added API2 generated feature markers for createTusAssembly() and waitForAssembly() in packages/node/src/Transloadit.ts.
• Added API2 generated endpoint markers for the current generated low-level Transloadit methods in packages/node/src/Transloadit.ts.
• Added a checked-in, hand-written devdock TUS Assembly example at packages/node/examples/api2-devdock-tus-assembly/main.ts.
• Added a checked-in, hand-written devdock Template lifecycle example at packages/node/examples/api2-devdock-template-lifecycle/main.ts.
• The generated blocks are owned by API2 contracts; fixes should land in API2 and be regenerated here.
• The examples are deliberately not generated: they are idiomatic consumer proofs that use generated SDK methods and write small result JSON files for API2 QA to assert.

Companion PRs

• API2 contract/generator source: https://github.com/transloadit/api2/pull/7928

Validation

• From API2: api2/bin/cli.ts contracts sdks --no-motd --target transloadit --platform typescript --sdk-root ../node-sdk --rewrite-sdk --compare-existing
• Node SDK: node --check packages/node/examples/api2-devdock-template-lifecycle/main.ts
• Node SDK: yarn biome check packages/node/examples/api2-devdock-template-lifecycle/main.ts
• From API2: core/bin/devdock.ts exec tstrun system/sdk_examples/typescript-transloadit-examples.test.ts -vv --max-time-per-test 480
• Node SDK: yarn workspace @transloadit/node check

Transloadit Companion PRs

• Content generated endpoint docs: https://github.com/transloadit/content/pull/5074
• Go SDK generated-region canary: Generated endpoint markers and devdock examples go-sdk#45
• Python SDK generated endpoints: Add asyncio support to the Python SDK python-sdk#57
• Java SDK generated endpoint markers: Generated Java SDK contract markers java-sdk#101