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/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.