Sort environment variables alphabetically in unified prompt step

[Copilot]

Environment variables in the "Append context instructions to prompt" step were appearing in non-deterministic order due to Go map iteration.

Changes

• pkg/workflow/unified_prompt_step.go: Sort environment variable keys alphabetically before output

  • Collect keys into slice, sort with sort.Strings(), iterate in order
  • Ensures consistent ordering: GH_AW_GITHUB_ACTOR, GH_AW_GITHUB_EVENT_*, etc.

• pkg/workflow/unified_prompt_step_test.go: Add TestGenerateUnifiedPromptStep_EnvVarsSorted to verify sorting

• 109 workflow lock files: Recompiled with sorted environment variables

Example

- name: Append context instructions to prompt
  env:
    GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
    GH_AW_GITHUB_ACTOR: ${{ github.actor }}
    GH_AW_GITHUB_EVENT_COMMENT_ID: ${{ github.event.comment.id }}
    GH_AW_GITHUB_EVENT_DISCUSSION_NUMBER: ${{ github.event.discussion.number }}
    GH_AW_GITHUB_EVENT_ISSUE_NUMBER: ${{ github.event.issue.number }}
    # ... (sorted alphabetically)

Original prompt

The environment variable names in "Append context instructions to prompt" need to be sorted.

 - name: Append context instructions to prompt
        env:
          GH_AW_PROMPT: /tmp/gh-aw/aw-prompts/prompt.txt
          GH_AW_GITHUB_REPOSITORY: ${{ github.repository }}
          GH_AW_GITHUB_RUN_ID: ${{ github.run_id }}
          GH_AW_GITHUB_WORKSPACE: ${{ github.workspace }}
          GH_AW_GITHUB_ACTOR: ${{ github.actor }}
          GH_AW_GITHUB_EVENT_COMMENT_ID: ${{ github.event.comment.id }}
          GH_AW_GITHUB_EVENT_DISCUSSION_NUMBER: ${{ github.event.discussion.number }}
          GH_AW_GITHUB_EVENT_ISSUE_NUMBER: ${{ github.event.issue.number }}
          GH_AW_GITHUB_EVENT_PULL_REQUEST_NUMBER: ${{ github.event.pull_re

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