Add fix codemod to migrate safe-outputs message ET suffix placeholders to AI credits suffix

[Copilot]

Custom safe-outputs.messages templates still using {effective_tokens_suffix} continued to render ET-oriented footer text. This change introduces a fix codemod that rewrites those frontmatter placeholders to {ai_credits_suffix} so migrated workflows render AIC suffixes by default.

• Codemod added

  • Introduced messages-effective-tokens-suffix-to-ai-credits-suffix.
  • Rewrites placeholder usage inside safe-outputs.messages from:
    • {effective_tokens_suffix} → {ai_credits_suffix}

• Transformation scope

  • Applies only to YAML frontmatter.
  • Targets only safe-outputs.messages entries (not unrelated fields).
  • Handles both inline scalar message values and block scalar (| / >) message bodies.
  • Preserves existing indentation, comments, and markdown body content.

• Fix pipeline integration

  • Registered in the gh aw fix codemod registry immediately after the effective-tokens budget migration codemod to keep ET→AIC migrations ordered and coherent.

• Example migration

  safe-outputs:
  messages:
  footer: "> [{workflow_name}]({run_url}){effective_tokens_suffix}"run-failure: | Failed run Cost: {effective_tokens_suffix}

  becomes

  safe-outputs:
  messages:
  footer: "> [{workflow_name}]({run_url}){ai_credits_suffix}"run-failure: | Failed run Cost: {ai_credits_suffix}

[Copilot]

Pull request overview

Adds a new gh aw fix codemod to migrate safe-outputs.messages templates that still use the legacy {effective_tokens_suffix} placeholder so they render the AI Credits suffix via {ai_credits_suffix} after the ET→AIC budget migration.

Changes:

• Registered a new codemod (messages-effective-tokens-suffix-to-ai-credits-suffix) in the fix codemod registry immediately after effective-tokens-to-ai-credits.
• Implemented a frontmatter-only line-transform that targets safe-outputs.messages scalar values and block scalars (| / >), replacing {effective_tokens_suffix} with {ai_credits_suffix}.
• Added unit tests covering registry presence/order and basic formatting + block-scalar preservation.

Show a summary per file

File	Description
pkg/cli/fix_codemods.go	Registers the new messages placeholder migration codemod in the fix registry.
pkg/cli/fix_codemods_test.go	Updates expected codemod presence and ordering to include the new codemod.
pkg/cli/codemod_messages_effective_tokens_suffix_to_ai_credits_suffix.go	Implements the new codemod that rewrites {effective_tokens_suffix} to {ai_credits_suffix} inside safe-outputs.messages in frontmatter.
pkg/cli/codemod_messages_effective_tokens_suffix_to_ai_credits_suffix_test.go	Adds unit tests validating the codemod metadata and transformation behavior (including block scalars).

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• Files reviewed: 4/4 changed files
• Comments generated: 1