Replace consumed tool results with compact markers before each LLM call,
freeing context budget in multi-turn agent runs. A tool result is
"consumed" once the assistant has produced a response after seeing it.
- Add `compressToolResults` option to AgentConfig / RunnerOptions
- Runs before contextStrategy (lightweight, no LLM calls)
- Error results and short results (< minChars, default 500) are skipped
- 9 test cases covering default off, compression, parallel tools,
4+ turn compounding, error exemption, custom threshold, and
contextStrategy coexistence
JackChen