AGENTS.md Changes

AGENTS.md teaches an AI helper how to work on the DockB project. The changes tighten up that workflow.

New "Commands" section — adds 3 trigger phrases:

• "start work" — run the whole workflow (A–E)
• "tdd" — run just step C, picking up from a saved plan
• "wrap up" — run just step E

## Commands

- **"start work"** / **"start-work"** — begin the [Workflow](#workflow) section, starting at
  step 1 (Understand the request) through step 9. Do not run any other workflow or skill.
- **"tdd"** / **"TDD"** — begin the [3. Build — the TDD loop](#3-build--the-tdd-loop) section,
  working on the next uncompleted section of the plan breakdown.
- **"wrap up"** / **"wrap-up"** — begin the [Wrap-up](#wrap-up) section.

I had to explicitly tell it not to use my Claude skills, because that would muddy the water, so under the "Core principles" section:

- Never use tools, skills, or any files under `/home/brian-modra/.claude`.

Workflow got a stricter structure:

• Steps renamed from numbers (1, 2, 3) to letters (A, B, C, D, E).
• The AI must announce which step it's on (e.g. "C.3") and give a short summary before moving on.
• Plans are now saved to a file (~/.cache/dockb/plan.md) so a later "tdd" run can pick up where it left off, instead of just keeping them in memory.
• After committing each section, the AI must pause and ask whether to continue or wrap up.
• "Loop" and "Wrap-up" promoted to full steps D and E.

Smaller clarifications:

• Replaced the Executive Summary "if it exists, replace it" with "replace it wherever it is, and put it at the top".
• Added the rule that a "tdd" run asks the user if the plan file is missing or outdated.