docs(testing): describe the Quorum eval lab accurately, replacing stale Drill references

The evals harness was renamed Drill -> Quorum and rewritten from
Python/uv to Bun/TypeScript; docs/testing.md and CLAUDE.md still
described the old tool. Beyond the rename, the old text also
misdescribed the system: quorum is the harness CLI, one part of the
eval lab — it drives real coding-agent CLIs through a Gauntlet QA
agent and grades against scenario acceptance criteria plus
deterministic post-checks. The quick start now matches the eval
repo's actual commands (bun install / bun run quorum run
scenarios/<name> --coding-agent claude; scenarios are directories,
not *.yaml) and points at the Live Eval Risk section before anyone
runs a permissive-mode session.

Drift reported in closed PR #2121 (@JFWaskin); that PR's replacement
quick start kept the uv commands, so this rewrite goes from the eval
repo's README instead.

CLAUDE.md

@@ -101,7 +101,7 @@ Skills are not prose — they are code that shapes agent behavior. If you modify
 
 ## Eval harness
 
-Skill-behavior evals live in [superpowers-evals](https://github.com/prime-radiant-inc/superpowers-evals/), cloned into `evals/` — see `evals/README.md` for setup. Drill (the harness) drives real tmux sessions of Claude Code / Codex / Gemini CLI and judges skill compliance with an LLM verifier. Plugin-infrastructure tests still live at `tests/`.
+Skill-behavior evals live in [superpowers-evals](https://github.com/prime-radiant-inc/superpowers-evals/), cloned into `evals/` — see `evals/README.md` for setup. Quorum (the harness CLI, one part of that eval lab) drives real coding-agent CLIs — Claude Code, Codex, Gemini, and others — through a Gauntlet QA agent and grades them against scenario acceptance criteria plus deterministic post-checks. Plugin-infrastructure tests still live at `tests/`.
 
 ## Understand the Project Before Contributing
 

docs/testing.md

@@ -14,23 +14,24 @@ Live in `tests/`. Currently:
 - `tests/codex-plugin-sync/` — bash sync verification.
 - `tests/kimi/` — bash/Python checks for Kimi plugin manifest wiring.
 - `tests/claude-code/test-helpers.sh`, `analyze-token-usage.py` — utilities used by remaining bash tests.
-- `tests/claude-code/test-subagent-driven-development.sh` — agent-can-describe-SDD test (no drill counterpart; tests description-recall, not behavior).
-- `tests/claude-code/test-subagent-driven-development-integration.sh` — extended SDD integration with token analysis (drill covers the YAGNI subset; bash adds commit-count, Claude Code task-tracking, and token telemetry assertions).
-- `tests/claude-code/test-worktree-native-preference.sh` — RED-GREEN-REFACTOR validation for worktree skill (drill covers the PRESSURE phase; bash also covers RED/GREEN baselines).
-- `tests/explicit-skill-requests/` — Haiku-specific, multi-turn, and skill-name-prompted tests not covered by drill.
+- `tests/claude-code/test-subagent-driven-development.sh` — agent-can-describe-SDD test (no quorum counterpart; tests description-recall, not behavior).
+- `tests/claude-code/test-subagent-driven-development-integration.sh` — extended SDD integration with token analysis (quorum covers the YAGNI subset; bash adds commit-count, Claude Code task-tracking, and token telemetry assertions).
+- `tests/claude-code/test-worktree-native-preference.sh` — RED-GREEN-REFACTOR validation for worktree skill (quorum covers the PRESSURE phase; bash also covers RED/GREEN baselines).
+- `tests/explicit-skill-requests/` — Haiku-specific, multi-turn, and skill-name-prompted tests not covered by quorum.
 - `tests/diagnosing-superpowers/test-skill-structure.sh` — structural checks for the diagnosing-superpowers skill (frontmatter, referenced files, leak scan, word budget); behavior-scenario eval records are kept by the maintainer outside the repo.
 
 Run plugin tests via the relevant directory's `run-*.sh` or `npm test`.
 
 ## Skill behavior evals
 
-Live in `evals/`. Drill is the harness; scenarios live at `evals/scenarios/*.yaml`. See `evals/README.md` for setup. Quick start:
+Live in `evals/` (the [superpowers-evals](https://github.com/prime-radiant-inc/superpowers-evals/) eval lab, since renamed from Drill). Quorum is the harness CLI — one part of the system: it drives real coding-agent CLIs through a Gauntlet QA agent and grades them against each scenario's acceptance criteria plus deterministic post-checks. Scenarios live at `evals/scenarios/<name>/`. See `evals/README.md` for setup, the container runtime, and the safety model. Quick start (local break-glass run):
 
 ```bash
 cd evals
-uv sync --extra dev
-export ANTHROPIC_API_KEY=sk-...
-uv run drill run triggering-test-driven-development -b claude
+bun install
+export SUPERPOWERS_ROOT=/path/to/superpowers
+bun run quorum run scenarios/triggering-test-driven-development --coding-agent claude
+bun run quorum show <run-dir>
 ```
 
-Drill scenarios are slow (3-30+ minutes each) and run real LLM sessions. They are not part of CI today; the natural follow-up is a tiered model (fast subset on PR, full sweep nightly + on-demand).
+Quorum scenarios are slow (3-30+ minutes each) and run real LLM sessions in permissive modes — read `evals/README.md`'s Live Eval Risk section first. Only the static gates (`bun run check`, `bun run quorum check`) are safe for public CI; the natural follow-up remains a tiered model (static gates on PR, live sweep nightly + on-demand).