Add version input parameter to release workflow with auto-deduction fallback

[Copilot]

The release workflow required manual version updates to autowrap/version.py before triggering. This adds the ability to specify the release version as a workflow input, with automatic deduction from the source file as fallback.

Changes

• New version input: Optional parameter to specify release version directly when triggering workflow
• Auto-deduction: When empty, reads version from autowrap/version.py
• Version file sync: When version is specified, updates version.py before build so package metadata matches
• Input validation: Both version and next_version are validated against ^[0-9]+\.[0-9]+\.[0-9]+$
• Cleanup: Removed obsolete "please make sure version numbers are updated" comment

Workflow inputs

Input	Description
version	Version to release (empty = use version from autowrap/version.py)
next_version	Next development version (empty = minor bump from release version)

Original prompt

update the release-autowrap.yaml to allow entering the version number (or ideally deducing from files in this repo)

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