[Infra] Add verbose logging for work directory in runAgent

[ViktorHofer]

Log the work directory and skill type when verbose mode is enabled.

[Copilot]

Pull request overview

Adds additional verbose-mode diagnostics to the skill validator runner to help understand where the agent session is executing and whether it’s using a skill or running baseline.

Changes:

• Emit a verbose log line showing the temporary work directory path.
• Include whether the run is “skilled” vs “baseline” in that verbose log.

Comments suppressed due to low confidence (2)

eng/skill-validator/src/runner.ts:131

• write is initialized here and again inside the verbose event handler (and the event handler currently allocates a new function on every event). Consider hoisting a single const write = … near the top of runAgent (or when verbose is true) and reusing it for both the work-dir message and per-event logging to avoid duplication and per-event allocations.

  if (verbose) {
    const write = options.log ?? ((msg: string) => process.stderr.write(`${msg}\n`));
    write(`      📂 Work dir: ${workDir} (${skill ? 'skilled' : 'baseline'})`);
  }

eng/skill-validator/src/runner.ts:130

• This template literal uses single-quoted string literals ('skilled'/'baseline') in a file that otherwise consistently uses double quotes for string literals. Consider switching these to double quotes for consistency within the TypeScript codebase.

    write(`      📂 Work dir: ${workDir} (${skill ? 'skilled' : 'baseline'})`);

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