epic: expand tool output filter coverage

[bug-ops]

Motivation

The current filter system covers 6 command families (cargo test/clippy/build, git, ls, log dedup). Real-world agent sessions involve dozens of CLI tools producing verbose output that wastes context tokens. Expanding filter coverage can reduce token consumption by 60-95% across typical workflows.

Architecture

PR #734 migrated all hardcoded filters to a declarative TOML engine with 9 built-in strategy types (strip_noise, truncate, keep_matching, strip_annotated, test_summary, group_by_rule, git_status, git_diff, dedup). New filters are added as TOML rules in default-filters.toml — no Rust code changes needed for simple cases.

Current Coverage (19 rules in default-filters.toml)

Rule	Commands	Status
cargo-build	cargo build/run/check	done (#734)
cargo-test	cargo test/nextest	done (#734)
cargo-clippy	cargo clippy	done (#734)
git-status	git status	done (#734)
git-diff	git diff	done (#734)
git-log	git log	done (#734)
git-push	git push	done (#734)
ls	ls	done (#734)
log-dedup	journalctl, tail -f, docker logs	done (#734)
docker-build	docker build	done (#734)
docker-compose	docker compose	done (#734)
npm-install	npm/yarn/pnpm install	done (#734)
pip-install	pip install	done (#734)
make	make/cmake	done (#734)
pytest	pytest	done (#734)
go-test	go test/build	done (#734)
terraform-plan	terraform plan/apply	done (#734)
kubectl-get	kubectl	done (#734)
brew-install	brew install	done (#734)

Remaining

• feat: add find output truncation filter #722 find output truncation filter
• feat: add grep/rg output truncation filter #725 grep/rg truncation filter
• feat: add curl/wget output filter #726 curl/wget filter
• feat: add du/df/ps output filter #727 du/df/ps filter
• feat: add JS test runner output filter (jest/mocha/vitest) #732 JS test runners (jest/mocha/vitest)
• feat: add generic linter output filter (eslint/ruff/mypy/pylint) #733 Generic linter filter (eslint/ruff/mypy/pylint)