docs: sync documentation with Sprint 4 & 5 commands

- Update CLAUDE.md version from 5.1.0 to 5.2.0
- Update marketplace.json plugin versions to match CHANGELOG
  - projman 3.2.0 → 3.3.0
  - git-flow 1.0.0 → 1.2.0
  - pr-review 1.0.0 → 1.1.0
  - clarity-assist 1.0.0 → 1.2.0
  - doc-guardian 1.0.0 → 1.1.0
  - claude-config-maintainer 1.0.0 → 1.1.0
  - cmdb-assistant 1.1.0 → 1.2.0
  - data-platform 1.0.0 → 1.2.0
  - viz-platform 1.0.0 → 1.1.0
  - contract-validator 1.0.0 → 1.2.0
- Add 18 missing commands to README.md and COMMANDS-CHEATSHEET.md
  - /sprint-diagram, /pr-diff, /changelog-gen, /doc-coverage
  - /stale-docs, /config-diff, /config-lint, /cmdb-topology
  - /change-audit, /ip-conflicts, /lineage-viz, /dbt-test
  - /data-quality, /chart-export, /accessibility-check
  - /breakpoints, /dependency-graph
- Add contract-validator plugin to COMMANDS-CHEATSHEET.md

Closes #277

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -11,7 +11,7 @@
   "plugins": [
     {
       "name": "projman",
-      "version": "3.2.0",
+      "version": "3.3.0",
       "description": "Sprint planning and project management with Gitea integration",
       "source": "./plugins/projman",
       "author": {
@@ -27,7 +27,7 @@
     },
     {
       "name": "doc-guardian",
-      "version": "1.0.0",
+      "version": "1.1.0",
       "description": "Automatic documentation drift detection and synchronization",
       "source": "./plugins/doc-guardian",
       "author": {
@@ -75,7 +75,7 @@
     },
     {
       "name": "cmdb-assistant",
-      "version": "1.1.0",
+      "version": "1.2.0",
       "description": "NetBox CMDB integration with data quality validation and machine registration",
       "source": "./plugins/cmdb-assistant",
       "author": {
@@ -91,7 +91,7 @@
     },
     {
       "name": "claude-config-maintainer",
-      "version": "1.0.0",
+      "version": "1.1.0",
       "description": "CLAUDE.md optimization and maintenance for Claude Code projects",
       "source": "./plugins/claude-config-maintainer",
       "author": {
@@ -106,7 +106,7 @@
     },
     {
       "name": "clarity-assist",
-      "version": "1.0.0",
+      "version": "1.2.0",
       "description": "Prompt optimization and requirement clarification with ND-friendly accommodations",
       "source": "./plugins/clarity-assist",
       "author": {
@@ -121,7 +121,7 @@
     },
     {
       "name": "git-flow",
-      "version": "1.0.0",
+      "version": "1.2.0",
       "description": "Git workflow automation with intelligent commit messages and branch management",
       "source": "./plugins/git-flow",
       "author": {
@@ -136,7 +136,7 @@
     },
     {
       "name": "pr-review",
-      "version": "1.0.0",
+      "version": "1.1.0",
       "description": "Multi-agent pull request review with confidence scoring and actionable feedback",
       "source": "./plugins/pr-review",
       "author": {
@@ -152,7 +152,7 @@
     },
     {
       "name": "data-platform",
-      "version": "1.0.0",
+      "version": "1.2.0",
       "description": "Data engineering tools with pandas, PostgreSQL/PostGIS, and dbt integration",
       "source": "./plugins/data-platform",
       "author": {
@@ -168,7 +168,7 @@
     },
     {
       "name": "viz-platform",
-      "version": "1.0.0",
+      "version": "1.1.0",
       "description": "Visualization tools with Dash Mantine Components validation, Plotly charts, and theming",
       "source": "./plugins/viz-platform",
       "author": {
@@ -184,7 +184,7 @@
     },
     {
       "name": "contract-validator",
-      "version": "1.0.0",
+      "version": "1.2.0",
       "description": "Cross-plugin compatibility validation and Claude.md agent verification",
       "source": "./plugins/contract-validator",
       "author": {