feat: add 5 lifecycle extensions to community catalog (#2049)

* feat: add 5 gstack-inspired lifecycle commands (critique, review, qa, ship, retro)

Add 5 new core command templates inspired by Garry Tan's GStack to complete
the spec-driven development lifecycle:

- /speckit.critique: Dual-lens product + engineering review before implementation
- /speckit.review: Staff-level code review (correctness, security, performance)
- /speckit.qa: Systematic QA testing (browser-driven and CLI modes)
- /speckit.ship: Release automation (pre-flight, changelog, CI, PR creation)
- /speckit.retro: Sprint retrospective with metrics and improvement suggestions

Each command includes:
- Command template in templates/commands/
- Output report template in templates/
- Extension hook support (before_*/after_*)
- YAML frontmatter with prerequisite scripts

Updated README.md workflow from 6 to 11 steps and added CHANGELOG entry.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Revert "feat: add 5 gstack-inspired lifecycle commands (critique, review, qa, ship, retro)"

This reverts commit 6eb15a7a3e.

* feat: add 5 lifecycle extensions to community catalog

Add the following community extensions:
- staff-review: Staff-engineer-level code review
- qa: Systematic QA testing with browser/CLI validation
- ship: Release engineering automation
- retro: Sprint retrospective with metrics
- critique: Dual-lens spec and plan critique

Each extension is hosted in its own repository under arunt14/
with v1.0.0 releases available.

* fix: resolve mojibake encoding, sort keys, rename retro extension

- Fix double-encoded em dashes and arrows in catalog.community.json
- Sort extension entries alphabetically by key
- Rename 'Retrospective Extension' to 'Retro Extension' to avoid
  name collision with existing 'retrospective' extension

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

README.md

@@ -203,12 +203,17 @@ The following community-contributed extensions are available in [`catalog.commun
 | Product Forge | Full product lifecycle: research → product spec → SpecKit → implement → verify → test | `process` | Read+Write | [speckit-product-forge](https://github.com/VaiYav/speckit-product-forge) |
 | Project Health Check | Diagnose a Spec Kit project and report health issues across structure, agents, features, scripts, extensions, and git | `visibility` | Read-only | [spec-kit-doctor](https://github.com/KhawarHabibKhan/spec-kit-doctor) |
 | Project Status | Show current SDD workflow progress — active feature, artifact status, task completion, workflow phase, and extensions summary | `visibility` | Read-only | [spec-kit-status](https://github.com/KhawarHabibKhan/spec-kit-status) |
+| QA Testing Extension | Systematic QA testing with browser-driven or CLI-based validation of acceptance criteria from spec | `code` | Read-only | [spec-kit-qa](https://github.com/arunt14/spec-kit-qa) |
 | Ralph Loop | Autonomous implementation loop using AI agent CLI | `code` | Read+Write | [spec-kit-ralph](https://github.com/Rubiss/spec-kit-ralph) |
 | Reconcile Extension | Reconcile implementation drift by surgically updating feature artifacts. | `docs` | Read+Write | [spec-kit-reconcile](https://github.com/stn1slv/spec-kit-reconcile) |
+| Retro Extension | Sprint retrospective analysis with metrics, spec accuracy assessment, and improvement suggestions | `process` | Read+Write | [spec-kit-retro](https://github.com/arunt14/spec-kit-retro) |
 | Retrospective Extension | Post-implementation retrospective with spec adherence scoring, drift analysis, and human-gated spec updates | `docs` | Read+Write | [spec-kit-retrospective](https://github.com/emi-dm/spec-kit-retrospective) |
 | Review Extension | Post-implementation comprehensive code review with specialized agents for code quality, comments, tests, error handling, type design, and simplification | `code` | Read-only | [spec-kit-review](https://github.com/ismaelJimenez/spec-kit-review) |
 | SDD Utilities | Resume interrupted workflows, validate project health, and verify spec-to-task traceability | `process` | Read+Write | [speckit-utils](https://github.com/mvanhorn/speckit-utils) |
+| Staff Review Extension | Staff-engineer-level code review that validates implementation against spec, checks security, performance, and test coverage | `code` | Read-only | [spec-kit-staff-review](https://github.com/arunt14/spec-kit-staff-review) |
 | Superpowers Bridge | Orchestrates obra/superpowers skills within the spec-kit SDD workflow across the full lifecycle (clarification, TDD, review, verification, critique, debugging, branch completion) | `process` | Read+Write | [superpowers-bridge](https://github.com/RbBtSn0w/spec-kit-extensions/tree/main/superpowers-bridge) |
+| Ship Release Extension | Automates release pipeline: pre-flight checks, branch sync, changelog generation, CI verification, and PR creation | `process` | Read+Write | [spec-kit-ship](https://github.com/arunt14/spec-kit-ship) |
+| Spec Critique Extension | Dual-lens critical review of spec and plan from product strategy and engineering risk perspectives | `docs` | Read-only | [spec-kit-critique](https://github.com/arunt14/spec-kit-critique) |
 | Spec Sync | Detect and resolve drift between specs and implementation. AI-assisted resolution with human approval | `docs` | Read+Write | [spec-kit-sync](https://github.com/bgervin/spec-kit-sync) |
 | Understanding | Automated requirements quality analysis — 31 deterministic metrics against IEEE/ISO standards with experimental energy-based ambiguity detection | `docs` | Read-only | [understanding](https://github.com/Testimonial/understanding) |
 | V-Model Extension Pack | Enforces V-Model paired generation of development specs and test specs with full traceability | `docs` | Read+Write | [spec-kit-v-model](https://github.com/leocamello/spec-kit-v-model) |