deps: focus-core no longer depends on tokio at all (the core is fully
synchronous); workspace-level tokio drops the fat feature list, members
declare only what they use (transport: net/io-util/time, providers: rt/time)
code: remove dead AgentHandle (never constructed) and the dead
App::clamp_scroll; wire focus-harness' describe_plan into the TUI compaction
note (it was unused public API); clean a no-op replace_messages + confusing
comment in the compaction integration test
docs: AGENTS.md §2.2 tokio table reflects the new feature sets; README test
count 177→181, new env-var section (FOCUS_DATA_DIR / FOCUS_SHELL /
FOCUS_DEBUG_FILE), wheel + two-level expansion keybindings; add LICENSE (MIT,
matching Cargo.toml); TUI /help notes the two-level expansion and merged
tool blocks; delete the .VSCodeCounter artifact dir
verification: fmt, clippy -D warnings, 181 tests, workspace build all green
bf92590fcd