refactor: deduplicate installer-mcp + decompose installWorkflows
installer-mcp.ts (678→462):
- Extract configureMcpInClaude() shared pipeline, eliminates 3x duplication
- Extract mirrorCcgServers() + formatSyncMessage() for sync dedup
- installAceTool/installAceToolRs/installFastContext now thin wrappers
installer.ts — decompose installWorkflows (290-line monolith → 6 sub-functions):
- installCommandFiles, installAgentFiles, installPromptFiles
- installSkillFiles, installRuleFiles, installBinaryFile
- Shared InstallContext interface passes state between steps
Total: 1926→1724 lines (-202), dist 215→212 kB (-3 kB)
li
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