types: clarify DispatchNamespace.get does not throw on missing worker (fixes #5263)

[LeSingh1]

Summary

The JSDoc for DispatchNamespace.get in types/defines/wfp.d.ts claimed:

@throws If the Worker script does not exist in this dispatch namespace, an error will be thrown.

In practice, get always returns a Fetcher; the "Worker not found" error is only surfaced when the returned Fetcher's fetch() is invoked. The reporter demonstrated this with a clear repro in #5263. The dynamic dispatch example in the Cloudflare docs already documents the workaround (e.message.startsWith('Worker not found') inside the fetch() try/catch), which confirms the runtime behavior is intentional — only the JSDoc was misleading.

Fix

Replaced the inaccurate @throws line with a note describing the actual behavior and where the error surfaces. This is a docs-only change; no runtime behavior is affected.

Updated:

• types/defines/wfp.d.ts — the source definition (the file the issue links to is generated from this).
• The four corresponding generated snapshots under types/generated-snapshot/{latest,experimental}/index.{ts,d.ts} so the snapshot check stays green. (I do not have a Bazel build environment to regenerate them via bazel build //types:types; if reviewers prefer the snapshots be regenerated, please tell me and I'll redo locally.)

Verification

• grep -rn "@throws If the Worker script does not exist" types/ returns no remaining matches after the patch.
• Patch is comments-only — no source/runtime change.

Issue

Fixes #5263

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[LeSingh1]

I have read the CLA Document and I hereby sign the CLA

[petebacondarwin]

LGTM as a docs change

[codspeed-hq]

Merging this PR will degrade performance by 12.74%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 71 untouched benchmarks
⏩ 129 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	Encode_ASCII_32[TextEncoder][0/0/32]	2.8 ms	3.2 ms	-12.74%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing LeSingh1:docs-dispatch-namespace-throws-on-fetch (5178de8) with main (6b8b117)}

Footnotes

1. 129 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩