The companion chat had its own ad-hoc 3-round tool-calling pipeline:
build a system prompt with tool descriptions, ask the LLM to emit
```tool JSON blocks, regex-extract, execute, feed back the result as
a synthetic user message. Same fragility class as the old text-JSON
planner — and now unnecessary since mana-llm speaks native function
calling.
Migrates companion/engine.ts to the shared runPlannerLoop, same as
the mission runner (commit 5a) and the server tick (commit 6). Tools
go to the LLM as proper function-schemas; tool_calls come back
structured; the executor runs them directly under USER_ACTOR.
Extends shared-ai/planner/loop.ts with an optional priorMessages[]
input field so the chat can preserve multi-turn history between
turns (missions don't need this and leave it empty).
Deletes the old llm-tasks/companion-chat.ts LlmTask wrapper. Nothing
else imported it.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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