Tool outputs (read_file, grep_files, exec_shell, fetch_url, web_search) that
exceed a configurable token threshold are now intercepted before they reach
the parent context. A structured synthesis header replaces the raw blob; the
full content is stored in the workshop variable `last_tool_result` for later
`promote_to_context` retrieval.
Key changes:
- New `crates/tui/src/tools/large_output_router.rs`: `LargeOutputRouter`,
`WorkshopConfig`, `WorkshopVariables`, `RouteDecision`, token estimator,
synthesis-prompt builder, and wrap_synthesis helper. Full unit-test suite.
- `ToolContext` gains `large_output_router` and `workshop_vars` fields plus
the `with_large_output_router` builder; constructor defaults are `None` so
sub-agents and test contexts are unaffected.
- `ToolRegistry::execute_full_with_context` applies routing after every tool
call; `raw=true` in the tool input bypasses routing for that invocation.
- `EngineConfig` gains a `workshop` field; `Engine::new` creates the shared
`WorkshopVariables` Arc when the field is present and wires it into every
`build_tool_context` call.
- `Config` gains `[workshop]` table deserialization; `merge_config` propagates
it like other optional tables.
- `config.example.toml` documents `[workshop]`, `large_output_threshold_tokens`
(default 4096), and per-tool threshold overrides.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
wangfeng
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