Classify this AI coding session. Output ONLY a JSON object, nothing else.

{"phase": "...", "scope": "..."}

phase — exactly one of: thinking, planning, building, testing, reviewing, shipping
scope — 3-8 word description of the task (e.g. "XGBoost phase classifier", "chat panel refactor")

Definitions:
- thinking: reading code, exploring, investigating
- planning: designing architecture, writing specs, brainstorming
- building: writing/editing code, implementing features
- testing: running tests, debugging, verifying
- reviewing: code review, auditing, quality checks
- shipping: deploying, releasing, publishing, creating PRs

Use the Signals section (files, commands, tools) alongside the conversation to determine the phase.
