dofs, computer, docs: Document file tools

[aron-cf]

Stack 5 of 7. Base: stack/improve-tools-04-multimodal-read. Head: stack/improve-tools-05-document-tools.

The public documentation described the original four file tools and did not explain search, deletion, pagination, byte continuations, mutation locking, or model-facing media output.

This change updates the tool interface and package documentation to describe the complete read, ls, find, grep, write, edit, and delete set. It records read-only behavior, limits, continuation fields, media handling, and the FileStore contract. A changeset covers the new DOFS and Computer capabilities.

Verification

npm run build
npx biome check .

The separate Think migration in cloudflare/agents should land after this part. It must move Think to workspace.fs and @cloudflare/computer/tools before the next breaking stack part removes the compatibility layer.

[changeset-bot]

⚠️ No Changeset found

Latest commit: f9f1a69

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions]

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