Add prompt_style A/B experiment to blog-auditor workflow

[Copilot]

This updates blog-auditor to run a prompt_style experiment (detailed vs concise) so we can measure whether a goal-oriented prompt reduces token/runtime cost without degrading audit correctness. The workflow prompt now supports compile-time variant selection while preserving the existing detailed path.

• Experiment configuration (frontmatter)

  • Added experiments.prompt_style with:
    • variants: [detailed, concise]
    • primary/secondary metrics
    • guardrail metrics
    • sample size, weights, start date, analysis type, tags
    • notify.issue set to the created issue number
  • Kept config aligned with current workflow schema (guardrail thresholds as expressions).

• Prompt variant branching

  • Wrapped audit instructions in a conditional on experiments.prompt_style.
  • Added a concise variant focused on outcomes (navigate, validate checks, create Audits discussion with pass/fail table and remediation).
  • Kept the existing detailed instruction body intact under the else branch.

• Compiled workflow artifact update

  • Regenerated blog-auditor.lock.yml to reflect the new experiment metadata and prompt conditional rendering.

{{#if experiments.prompt_style == 'concise' }}
## Audit Process
Navigate to the target URL with Playwright, capture accessibility snapshot, validate
status/url/content/keywords/snippets, then create an Audits discussion with a check summary.
{{else}}
## Audit Process
...existing detailed step-by-step instructions...
{{/if}}

[Copilot]

Pull request overview

Adds a prompt_style A/B experiment to the blog auditor workflow to compare detailed versus concise audit prompts.

Changes:

• Adds experiments.prompt_style metadata for detailed/concise variants.
• Wraps the audit prompt in a variant conditional and introduces a concise audit path.
• Regenerates the compiled lock workflow with experiment selection/state handling.

Show a summary per file

File	Description
.github/workflows/blog-auditor.md	Adds experiment metadata and concise/detailed prompt branching.
.github/workflows/blog-auditor.lock.yml	Regenerated workflow artifact with experiment state, selection, and propagation steps.

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• Files reviewed: 2/2 changed files
• Comments generated: 3