fix(ts-sdk): emit v0 root-import deprecation via process.emitWarning

[sushaan-k]

What does this PR do?

Replaces the seven raw console.warn calls that fire on import of @hatchet-dev/typescript-sdk with process.emitWarning(..., { type: 'DeprecationWarning', code: 'HATCHET_V0_REMOVED' }). The migration nag is still visible by default, but is now suppressible via Node's standard flags, deduplicated, and carries a stable code that consumers can filter on in process.on('warning', ...) handlers.

Why?

Importing the root specifier currently prints seven red console.warn lines on every process start because index.ts re-exports both ./workflow and ./step, and each submodule fires several raw console.warns at module evaluation. Those messages:

1. Cannot be filtered — --no-deprecation, --no-warnings, --no-warnings=DeprecationWarning have no effect.
2. Are not deduplicated — both submodules print near-identical banners on every boot.
3. Have no code — process.on('warning', …) handlers have nothing stable to match on.

This is friction every consumer of the root import hits today, including the v1 setup guide's documented entry point.

Changes

• New sdks/typescript/src/util/v0-deprecation-warning.ts exports emitV0RemovedWarning(submodule, detail?) and the stable V0_DEPRECATION_CODE = 'HATCHET_V0_REMOVED'. Falls back to console.warn only when the host runtime does not expose process.emitWarning.
• sdks/typescript/src/workflow.ts and sdks/typescript/src/step.ts replace their console.warn blocks with one emitV0RemovedWarning(...) call each.
• New sdks/typescript/src/util/v0-deprecation-warning.test.ts covers the emitWarning shape, the code, per-submodule dedupe, separate warnings for distinct submodules, and the console.warn fallback path.

Testing

```sh
cd sdks/typescript
pnpm exec jest src/util/ # 5 suites, 16 passed, 2 skipped — no regressions, new helper suite green
pnpm lint:check # clean
pnpm exec tsc # clean
```

Smoke-tested against Node 24:

```sh

Suppression flags now actually work

node --no-deprecation --require ts-node/register -e "require('./src/util/v0-deprecation-warning.ts').emitV0RemovedWarning('workflow')"
node --no-warnings=DeprecationWarning --require ts-node/register -e "require('./src/util/v0-deprecation-warning.ts').emitV0RemovedWarning('workflow')"

process.on('warning') receives a structured warning with .code === 'HATCHET_V0_REMOVED'

```

Notes for maintainers

• I matched the exact HATCHET_V0_REMOVED code shape suggested in the issue to make review easier. Happy to switch to per-submodule codes (HATCHET_V0_WORKFLOW_REMOVED, HATCHET_V0_STEP_REMOVED) if you'd prefer finer-grained suppression.
• The existing emitDeprecationNotice helper under v1/client/worker/deprecated/deprecation.ts was considered, but it requires a Logger instance — workflow.ts and step.ts fire at module-evaluation time with no logger context, and the issue's preferred shape was process.emitWarning anyway.

Closes #3915

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[Copilot]

Pull request overview

Updates the TypeScript SDK’s root-import v0 deprecation messaging to use Node’s standard warning mechanism (process.emitWarning) so consumers can suppress/dedupe/filter warnings using built-in Node flags and warning handlers.

Changes:

• Introduces a emitV0RemovedWarning(submodule, detail?) helper that emits DeprecationWarning with code HATCHET_V0_REMOVED (with a console.warn fallback).
• Replaces the module-evaluation console.warn blocks in workflow.ts and step.ts with a single helper call each.
• Adds unit tests covering the warning shape, code, per-submodule dedupe, and fallback behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
sdks/typescript/src/workflow.ts	Replaces v0 root-import console.warn banner with a single structured deprecation warning emission.
sdks/typescript/src/step.ts	Replaces v0 root-import console.warn banner with a single structured deprecation warning emission.
sdks/typescript/src/util/v0-deprecation-warning.ts	Adds centralized warning emission + per-submodule dedupe and fallback logic.
sdks/typescript/src/util/v0-deprecation-warning.test.ts	Adds Jest coverage for emission, code, dedupe, and fallback paths.