Remove plan comment step from single-phase workflow prompt

[xliry]

Problem

The prompt tells agents to "Post plan as comment (for audit trail)" on every task. This adds 2 extra API calls per task. For simple text edits (like lota-3's tasks), the commit message IS the audit trail. Plan comments are noise.

What to do

In src/daemon.ts, buildPrompt() function:

1. In the single phase block, remove the step that says to post a plan comment
2. The agent should go straight from reading → editing → building → pushing → completing
3. Keep the plan comment step ONLY in the plan phase (where it's the whole point)

Acceptance

• Single-phase agents no longer post plan comments
• Plan-phase agents still post plans (unchanged)
• Saves 2 API calls per single-phase task
• Build passes: npm run build

[xliry]

Completion Report

Removed plan comment step from single-phase workflow in buildPrompt(). Single-phase agents now go straight from explore → execute → build → push → complete, saving 2 API calls per task. Plan phase workflow is unchanged. Build passes.

Modified: src/daemon.ts