phxstack-plan

Write a local spec that survives the session. Do not implement it.

1. Inspect the relevant code and LEARNED.md when present.
2. Choose a short kebab-case slug and write .phxstack/specs/<slug>.md.
3. Include exactly these sections:

## What we're doing

## Steps

## What we're NOT doing

## How we'll know it works

Keep it to one page. Each step must be independently implementable and verifiable. Name concrete commands or observable behaviour in the final section.

Show the completed spec and stop for developer approval. Specs stay local; publish a named spec to GitHub only after the developer explicitly gives the green light.