Integrate Authenticator submodule into skills ecosystem

[fadidurah]

Add Authenticator (Microsoft Authenticator app) across all skills, agents, and prompt files to enable agentic work item completion for Authenticator code changes.

Changes:

• copilot-instructions.md: Add Authenticator to repo organization, repo- specific guidelines with full module catalog, and repository routing table
• codebase-researcher: Add Authenticator to repo structure table, key classes section, search scope, and anti-patterns
• feature-planner: Add authenticator to repo routing table with routing heuristic, and new Authenticator Feature common pattern
• design-author: Include Authenticator in components and cross-repo impact
• incident-investigator: Add Authenticator App Issues pattern with module reference for MFA, passkey, NGC, and crypto troubleshooting
• pbi-dispatcher: Add authenticator repo routing entry
• release-helper: Add note about Authenticator's separate release cycle
• test-planner: Add Authenticator-specific test scenario categories
• copilot-review-analyst: Add authenticator repo to analysis scope
• threat-modeler: Add Authenticator to process components
• pbi-template: Add authenticator as valid module target
• Agent files: Update codebase-researcher and feature-orchestrator agents with Authenticator search scope and repo slug mapping
• Prompt files: Update feature-status and feature-pr-iterate with Authenticator repo slug mapping

[github-actions]

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