docs: add Obra Superpowers eval + minor doc updates

- Add resource evaluation for Obra Superpowers (docs/resource-evaluations/)
- Minor updates to third-party-tools.md, ultimate-guide.md, spec-first.md, tdd-with-claude.md
- Update CHANGELOG

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

guide/ecosystem/third-party-tools.md

@@ -671,6 +671,7 @@ Claude Code's plugin system supports community-built extensions. For detailed do
 - **[agentskills.io](https://agentskills.io)** - Open standard for agent skills (26+ platforms)
 
 **Notable skill packs**:
+- **[Superpowers](https://github.com/obra/superpowers)** — Complete software development methodology suite (95k+ stars, 7.5k forks, MIT). 7 context-aware skills covering the full development arc: spec elicitation through Socratic brainstorming, detailed implementation planning (2-5 min tasks with exact file paths), subagent-driven development with two-stage review (spec compliance then code quality), mandatory TDD enforcement (code written before a test gets deleted), code review, git worktree management, and branch lifecycle completion (merge/PR/discard decision). Skills trigger automatically based on context — no manual invocation needed. Install: `/plugin install superpowers@claude-plugins-official`. Created by Jesse Vincent (Prime Radiant), MIT. Also supports Cursor, Codex, OpenCode, and Gemini CLI.
 - **[gstack](https://github.com/garrytan/gstack)** — 6-skill workflow suite covering the full ship cycle: strategic product gate (`/plan-ceo-review`), architecture review (`/plan-eng-review`), paranoid code review (`/review`), automated release (`/ship`), native browser QA (`/browse`), and retrospective (`/retro`). Created by Garry Tan (Y Combinator CEO). See [Cognitive Mode Switching](../workflows/gstack-workflow.md) for the workflow pattern and adoption guide.
 
 ---

guide/ultimate-guide.md

@@ -8101,7 +8101,7 @@ npx add-skill anthropics/claude-plugins-official  # CLAUDE.md auditor + automati
 | | frontend-design | 5.6K | anthropics |
 | **Database** | supabase-postgres-best-practices | 1K+ | supabase |
 | **Auth** | better-auth-best-practices | 2K+ | better-auth |
-| **Testing** | test-driven-development | 721 | obra |
+| **Testing** | test-driven-development | 721 | obra ([Superpowers](https://github.com/obra/superpowers)) |
 | **Media** | remotion-best-practices | New | remotion-dev |
 | **Meta** | skill-creator | 3.2K | anthropics |
 | **Tooling** | claude-md-improver | 472 | anthropics |

guide/workflows/spec-first.md

@@ -866,3 +866,4 @@ Claude: Reads CLAUDE.md + @CLAUDE-api.md (relevant context only)
 - [OpenSpec Documentation](https://github.com/Fission-AI/OpenSpec)
 - [tdd-with-claude.md](./tdd-with-claude.md) — Combine with TDD
 - [Spec-to-Code Factory](https://github.com/SylvainChabaud/spec-to-code-factory) — Implémentation référence complète avec enforcement outillé (6 gates via Node.js, invariants "No Spec No Code" + "No Task No Commit", ~900K tokens/projet)
+- [Superpowers](https://github.com/obra/superpowers) — Plugin suite (95k+ stars) with a `brainstorming` skill that enforces spec-first as a mandatory gate: the agent refuses to write code until a spec has been reviewed and approved. Install: `/plugin install superpowers@claude-plugins-official`.

guide/workflows/tdd-with-claude.md

@@ -314,3 +314,4 @@ Run tests after each change to ensure they stay green.
 - [examples/skills/tdd-workflow.md](../../examples/skills/tdd-workflow.md) — TDD skill template
 - [Anthropic Best Practices](https://www.anthropic.com/engineering/claude-code-best-practices)
 - [task-management.md](./task-management.md) — Track TDD cycles across sessions with Tasks API
+- [Superpowers](https://github.com/obra/superpowers) — Plugin suite that enforces TDD as a mandatory gate: code written before a failing test exists gets deleted and redone from scratch. Stricter enforcement than manual prompting.