[WIP] Update changeset.js to use current tag for entry generation

[Copilot]

Plan: Fix changeset.js to use current tag when generating changelog entry

• Understand the issue: When GH_AW_CURRENT_VERSION env var is set, it should be used as the release version directly, not bumped
• Modify runRelease() to check if GH_AW_CURRENT_VERSION is set
  • If set, use it directly as the release version (skip bumping)
  • If not set, calculate next version by bumping current version (existing behavior)
• Modify runVersion() similarly to show correct version
• Update documentation comments to clarify the behavior
• Test the changes manually to verify correct behavior
  • Test without GH_AW_CURRENT_VERSION: Works correctly (bumps version)
  • Test with GH_AW_CURRENT_VERSION: Works correctly (uses specified version)
• Run formatting and linting (make fmt-cjs, make lint-cjs)
• Run pre-commit validation (make agent-finish)

Original prompt

Update changeset.js to use current tag, not the next tag when generating the entry.

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[github-actions]

PR titles: [WIP] Update changeset.js to use current tag for entry generation; [WIP] Remove shared agentic workflow file and update usages
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Overall: FAIL

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