docs: remove dead Cognitive Squad and Understanding extension links and from extensions/catalog.community.json (#2057)

* docs: remove dead Cognitive Squad and Understanding extension links

Both repos (Testimonial/cognitive-squad and Testimonial/understanding)
have been deleted by their author. No forks or relocations exist.

* chore: remove dead extensions from community catalog

Remove cognitive-squad and understanding entries whose repos
have been deleted by their author.

README.md

@@ -182,7 +182,6 @@ The following community-contributed extensions are available in [`catalog.commun
 | Azure DevOps Integration | Sync user stories and tasks to Azure DevOps work items using OAuth authentication | `integration` | Read+Write | [spec-kit-azure-devops](https://github.com/pragya247/spec-kit-azure-devops) |
 | Checkpoint Extension | Commit the changes made during the middle of the implementation, so you don't end up with just one very large commit at the end | `code` | Read+Write | [spec-kit-checkpoint](https://github.com/aaronrsun/spec-kit-checkpoint) |
 | Cleanup Extension | Post-implementation quality gate that reviews changes, fixes small issues (scout rule), creates tasks for medium issues, and generates analysis for large issues | `code` | Read+Write | [spec-kit-cleanup](https://github.com/dsrednicki/spec-kit-cleanup) |
-| Cognitive Squad | Multi-agent cognitive system with Triadic Model: understanding, internalization, application — with quality gates, backpropagation verification, and self-healing | `docs` | Read+Write | [cognitive-squad](https://github.com/Testimonial/cognitive-squad) |
 | Conduct Extension | Orchestrates spec-kit phases via sub-agent delegation to reduce context pollution. | `process` | Read+Write | [spec-kit-conduct-ext](https://github.com/twbrandon7/spec-kit-conduct-ext) |
 | DocGuard — CDD Enforcement | Canonical-Driven Development enforcement. Validates, scores, and traces project documentation with automated checks, AI-driven workflows, and spec-kit hooks. Zero NPM runtime dependencies. | `docs` | Read+Write | [spec-kit-docguard](https://github.com/raccioly/docguard) |
 | Extensify | Create and validate extensions and extension catalogs | `process` | Read+Write | [extensify](https://github.com/mnriem/spec-kit-extensions/tree/main/extensify) |
@@ -216,7 +215,6 @@ The following community-contributed extensions are available in [`catalog.commun
 | 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) |
 | Verify Extension | Post-implementation quality gate that validates implemented code against specification artifacts | `code` | Read-only | [spec-kit-verify](https://github.com/ismaelJimenez/spec-kit-verify) |
 | Verify Tasks Extension | Detect phantom completions: tasks marked [X] in tasks.md with no real implementation | `code` | Read-only | [spec-kit-verify-tasks](https://github.com/datastone-inc/spec-kit-verify-tasks) |

extensions/catalog.community.json

@@ -167,50 +167,6 @@
       "created_at": "2026-02-22T00:00:00Z",
       "updated_at": "2026-02-22T00:00:00Z"
     },
-    "cognitive-squad": {
-      "name": "Cognitive Squad",
-      "id": "cognitive-squad",
-      "description": "Multi-agent cognitive system with Triadic Model: understanding, internalization, application — with quality gates, backpropagation verification, and self-healing",
-      "author": "Testimonial",
-      "version": "0.1.0",
-      "download_url": "https://github.com/Testimonial/cognitive-squad/archive/refs/tags/v0.1.0.zip",
-      "repository": "https://github.com/Testimonial/cognitive-squad",
-      "homepage": "https://github.com/Testimonial/cognitive-squad",
-      "documentation": "https://github.com/Testimonial/cognitive-squad/blob/main/README.md",
-      "changelog": "https://github.com/Testimonial/cognitive-squad/blob/main/CHANGELOG.md",
-      "license": "MIT",
-      "requires": {
-        "speckit_version": ">=0.3.0",
-        "tools": [
-          {
-            "name": "understanding",
-            "version": ">=3.4.0",
-            "required": false
-          },
-          {
-            "name": "spec-kit-reverse-eng",
-            "version": ">=1.0.0",
-            "required": false
-          }
-        ]
-      },
-      "provides": {
-        "commands": 10,
-        "hooks": 1
-      },
-      "tags": [
-        "ai-agents",
-        "cognitive",
-        "full-lifecycle",
-        "verification",
-        "multi-agent"
-      ],
-      "verified": false,
-      "downloads": 0,
-      "stars": 0,
-      "created_at": "2026-03-16T00:00:00Z",
-      "updated_at": "2026-03-18T00:00:00Z"
-    },
     "conduct": {
       "name": "Conduct Extension",
       "id": "conduct",
@@ -1280,47 +1236,6 @@
       "created_at": "2026-03-02T00:00:00Z",
       "updated_at": "2026-03-02T00:00:00Z"
     },
-    "understanding": {
-      "name": "Understanding",
-      "id": "understanding",
-      "description": "Automated requirements quality analysis — validates specs against IEEE/ISO standards using 31 deterministic metrics. Catches ambiguity, missing testability, and structural issues before they reach implementation. Includes experimental energy-based ambiguity detection using local LM token perplexity.",
-      "author": "Ladislav Bihari",
-      "version": "3.4.0",
-      "download_url": "https://github.com/Testimonial/understanding/archive/refs/tags/v3.4.0.zip",
-      "repository": "https://github.com/Testimonial/understanding",
-      "homepage": "https://github.com/Testimonial/understanding",
-      "documentation": "https://github.com/Testimonial/understanding/blob/main/extension/README.md",
-      "changelog": "https://github.com/Testimonial/understanding/blob/main/extension/CHANGELOG.md",
-      "license": "MIT",
-      "requires": {
-        "speckit_version": ">=0.1.0",
-        "tools": [
-          {
-            "name": "understanding",
-            "version": ">=3.4.0",
-            "required": true
-          }
-        ]
-      },
-      "provides": {
-        "commands": 3,
-        "hooks": 1
-      },
-      "tags": [
-        "quality",
-        "metrics",
-        "requirements",
-        "validation",
-        "readability",
-        "IEEE-830",
-        "ISO-29148"
-      ],
-      "verified": false,
-      "downloads": 0,
-      "stars": 0,
-      "created_at": "2026-03-07T00:00:00Z",
-      "updated_at": "2026-03-07T00:00:00Z"
-    },
     "v-model": {
       "name": "V-Model Extension Pack",
       "id": "v-model",