Document manual release process and package dry-run checks

[bnomei]

Context

The release process should remain manual for now. It needs cargo package --locked, cargo publish --dry-run, and a changelog policy rather than release-plz or automatic publishing.

Tasks

• Add release docs with manual steps.
• Add cargo package --locked and cargo publish --dry-run checks.
• Document changelog expectations.

Acceptance criteria

• A maintainer can follow documented manual release steps.
• Package and publish dry-run checks are available.
• No auto-publish workflow is introduced.

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:
#3

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 #3 only if all acceptance criteria are implemented; otherwise use Refs #3 and explain what remains.

[chatgpt-codex-connector]

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