fix(agent): disable hidden Goose tool-pair summarization

[AnthonyRonning]

Summary

• force GOOSE_TOOL_PAIR_SUMMARIZATION off whenever Maple initializes its embedded Goose runtime
• remove any inherited environment override before writing Maple-owned Goose configuration
• preserve exact tool evidence and prompt-cache continuity instead of silently replacing old tool pairs with hidden model-generated summaries
• add a regression test proving Maple overwrites a stale enabled value

Why

Goose enables tool-pair summarization by default for ordinary providers. It performs an extra inference, marks the original tool request/result agent-invisible, and inserts a user-invisible summary. Maple does not surface or own that lifecycle. In addition to changing the inference prefix, the persistence path can abort a run after a tool result when a referenced message row is missing.

Full context compaction remains unchanged.

Validation

• Maple pre-commit hook
  • Prettier check
  • TypeScript production build
  • 209 frontend tests
  • 135 Rust unit tests
• cargo clippy --lib -- -D warnings

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