Docs: Update CLAUDE.md and rbac.md for accuracy

[pascazzioIsAbyayalan]

Description

Multiple documentation inconsistencies found:

1. CLAUDE.md - Missing MCPServerRegistration from MCP resources list
2. CLAUDE.md - MCPOverviewPage description is outdated
3. docs/rbac.md - Contradictory all-namespaces behavior description

Current Behaviour

CLAUDE.md:65-68 - MCP Resources section lists:

• ✅ MCPGatewayExtension
• ✅ ReferenceGrant
• ❌ Missing: MCPServerRegistration (actually used in MCPOverviewPage)

CLAUDE.md:145-148 - Says:

"Empty state entry point for MCP Management with link to setup wizard"

But MCPOverviewPage now renders:

• Health statistics
• Resource tables (extensions, servers, grants)
• Attached policies
• RBAC-gated panels
• Empty state is just one conditional branch

docs/rbac.md:7 - Says:

"all-namespaces checks are cluster-scoped"

This contradicts actual #ALL_NS# implementation.

Expected Behaviour

Fix 1: Add to CLAUDE.md MCP Resources:

14. **MCPServerRegistration** (`mcp.kuadrant.io/v1`) - MCP server configuration and registration

Fix 2: Update CLAUDE.md MCPOverviewPage description:

**MCPOverviewPage**: MCP management dashboard with gateway/server health statistics, resource tables (MCPGatewayExtension, MCPServerRegistration, ReferenceGrant), attached policies list, and RBAC-gated panels. Shows setup wizard empty state when no extensions exist.

Fix 3: Audit and fix docs/rbac.md all-namespaces behavior to match implementation.

Locations

• CLAUDE.md:65-68 (MCP resources)
• CLAUDE.md:145-148 (MCPOverviewPage)
• docs/rbac.md:7 (all-namespaces)

Related

CodeRabbit comment in PR #734

[Anton-Fil]

i'd like to maki it closer to end of last sprint because we will add a lot of func soon