Add unit tests for skill-dispatcher module

[nikolasdehor]

Problem

The skill-dispatcher.js module (363 lines) in .aios-core/core/orchestration/ has zero test coverage. This module maps agent IDs to AIOS Skill invocations and handles dispatch payloads, output parsing, and agent validation.

Solution

Add comprehensive unit tests covering:

• Constructor — default options, skill mapping, agent personas, aliases
• getSkillName — mapped agents, alias resolution, fallback for unknown agents
• getAgentPersona — known agents, unknown fallback, aliases
• buildDispatchPayload — complete payload construction, args string with task/output/phase/yolo, array creates handling, tech stack flags (database, frontend, TypeScript), missing context defaults
• parseSkillOutput — null/undefined, structured objects, JSON in markdown code blocks, plain JSON strings, plain text truncation, invalid JSON fallback, unknown types
• createSkipResult — all fields populated
• formatDispatchLog — persona details, N/A fallback
• getAvailableAgents — primary agents only, aliases excluded
• isValidAgent — known agents, AIOS: prefix, unknown

Test Details

• 39 tests across 8 describe blocks
• No mocks needed (pure logic module)
• All tests passing

[nikolasdehor]

Covered by consolidated PR #426