[Automated][tcgc][skip chg] docs(tcgc): document default file uploads

[github-actions]

Caution

Protected files were modified in this change.
This pull request is in request_review mode and requires explicit human scrutiny before merge.

Protected files: .chronus/changes/add-default-file-upload-scenario-2026-08-31.md

Summary

• document the default application/octet-stream behavior for direct File request bodies
• add a Spector scenario covering default file uploads and regenerate the spec summary
• record the TCGC knowledge and incremental metadata updates, including the required Azure HTTP Specs feature changeset

Testing

• corepack pnpm format
• corepack pnpm lint
• TypeSpec compile and Azure HTTP Specs build/mock validation, cspell, formatting, lint, and docs regeneration
• targeted default file-upload server scenario passed

The full server suite continues to report 8 unrelated pre-existing failures.

Generated by Documentation Update Agent · gpt56 · 599 AIC · ⌖ 33.6 AIC · ⊞ 25.2K · ◷

---

Note

This was originally intended as a pull request, but the git push operation failed.

Original error: ERR_VALIDATION: pushSignedCommits: refusing unsigned push for branch 'docs/tcgc-default-file-upload-4dc988b0af8850b3': Signed-commit payload violates file-protection policy (request_review): .chronus/changes/add-default-file-upload-scenario-2026-08-31.md

Workflow Run: View run details and download bundle artifact

The bundle file is available in the agent artifact in the workflow run linked above.

To create a pull request with the changes:

# Download the artifact from the workflow run
gh run download 33376598767 -n agent -D /tmp/agent-33376598767

# Fetch the bundle into a temporary ref, then update the local branch
git fetch /tmp/agent-33376598767/aw-docs-tcgc-default-file-upload.bundle refs/heads/docs/tcgc-default-file-upload:refs/bundles/create-pr-docs-tcgc-default-file-upload-4dc988b0af8850b3-d4850af1
git update-ref refs/heads/docs/tcgc-default-file-upload-4dc988b0af8850b3 refs/bundles/create-pr-docs-tcgc-default-file-upload-4dc988b0af8850b3-d4850af1
git checkout docs/tcgc-default-file-upload-4dc988b0af8850b3
# Ensure the working tree matches the updated branch
git reset --hard
# Remove the temporary bundle ref
git update-ref -d refs/bundles/create-pr-docs-tcgc-default-file-upload-4dc988b0af8850b3-d4850af1

# Push the branch to origin
git push origin docs/tcgc-default-file-upload-4dc988b0af8850b3

# Create the pull request
gh pr create --title '[Automated][tcgc][skip chg] docs(tcgc): document default file uploads' --base main --head docs/tcgc-default-file-upload-4dc988b0af8850b3 --repo Azure/typespec-azure