Tighten and document optional socket dependency features

[bnomei]

Context

Socket support stays, but its dependency cost should be tightened where possible. If upstream prevents unifying duplicate reqwest/TLS stacks, document that cost on the socket feature.

Tasks

• Inspect rust_socketio and rust_engineio feature flags and newer versions.
• Disable unnecessary default features where supported.
• Document unavoidable duplicate HTTP/TLS dependencies if they remain.

Acceptance criteria

• Socket feature dependencies are as narrow as practical.
• Unavoidable dependency duplication is documented.
• Socket support remains available.

Notes

• Generated from the project improvement research pass.
• Keep implementation discussion repository-relative; do not include local machine paths or private setup details.

[bnomei]

@codex please implement this issue in bnomei/cloudconvert-sdk and open a pull request when done.

Use this GitHub issue as the source of truth:
#1

Scope:

• Implement only the tasks and acceptance criteria described in this issue.
• Prefer the smallest change that satisfies the issue.
• Add or update focused tests/docs only where the issue asks for them.
• Keep implementation discussion repository-relative.

Constraints:

• Follow repository conventions and any AGENTS.md guidance.
• Do not include local machine paths or private setup details in commits, PR text, or comments.
• Avoid broad refactors, rewrites, dependency churn, or unrelated cleanup.
• If the issue appears to require a large refactor, API redesign, or product decision, stop and comment back with the blocker instead of implementing.

Validation:

• Run the relevant repository checks/tests for the touched files.
• If checks cannot run in Codex Cloud, explain exactly why in the task summary or PR body.

PR expectation:

• Open a PR against the default branch if repository permissions allow it.
• Reference this issue in the PR body.
• Use Closes #1 only if all acceptance criteria are implemented; otherwise use Refs #1 and explain what remains.

[chatgpt-codex-connector]

To use Codex here, create an environment for this repo.