📖🔧：say what the declarations need from tsconfig

[DerekNonGeneric]

Requested by DerekNonGeneric

Before: the README's Requirements said TypeScript 6 was enough, and that it is the version every package is built and tested with. A TypeScript 6 project with a default tsconfig that imports @openinf/util still fails to type-check, with 16 Cannot find namespace 'Temporal' errors from util-date's declarations and Namespace 'globalThis' has no exported member 'Buffer' from util's. The packages also build with TypeScript 7 (each package's devDependency), not 6.

After: the section names the two settings those declarations need: esnext.temporal (or esnext) in lib, and node in types, which TypeScript 6 no longer fills in by itself. It also says that skipLibCheck hides the errors at the cost of the types. The false claim about the build version is gone.

How: checked against the packed tarballs of all thirteen packages in a clean project with TypeScript 6.0.3, under nodenext and bundler. It fails with default settings and passes once lib and types are set as described. README only, so there's no changeset.

Summary by CodeRabbit

• Documentation
  • Clarified TypeScript version requirements: TypeScript 6 or newer is needed for @openinf/util-date, @openinf/util-types, and @openinf/util; TypeScript 5.9 supports the other packages.
  • Documented the compiler library and type settings required when using these packages with TypeScript 6, including the Node.js types needed by @openinf/util. Also noted that skipLibCheck suppresses declaration errors but treats affected types as any.

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• README.md

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📝 Walkthrough

Walkthrough

The README limits the TypeScript 6 requirement to three packages. It documents compiler configuration needed when consuming their declarations.

Changes

TypeScript requirements

Layer / File(s)	Summary
Document package requirements README.md	The README specifies which packages require TypeScript 6 and notes that TypeScript 5.9 can read the other ten packages. It documents lib and types settings for declarations that use Temporal or Buffer. It also describes how skipLibCheck affects declaration checks.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 13d7c

Consumers of @openinf/util are told that @types/node is required for the documented Buffer types. No outstanding merge risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly describes the README change that documents the tsconfig requirements for the package declarations.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @README.md:
- Line 164: Update the TypeScript 6 guidance near the `node` entry in `types` to
state that consumers must install `@types/node` if it is not already available
before adding `node` to `types.

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• README.md

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