feat(discovery): route all released DCC products

[loonghao]

Summary

• derive one canonical 35-product discovery catalog from the released DCC-MCP CLI and owning adapter repositories, then generate every plugin, Skill, catalog, and GEO surface from it
• add bounded English/Chinese intent routing, aliases for 3ds Max, Unity/Tuanjie, Unreal/UE, Godot, and the complete released product set, with ambiguity and generic-term safeguards
• make DCC-CUA and ui-control one fail-closed project UI route with typed tools first, exact provider/runtime/PID/HWND attestation, fresh observation, post-action readback, and human handoff for CAPTCHA/auth/security challenges
• validate Core-sync ownership, cross-platform discovery, package parity, and universal agent installation

Validation

• python -m unittest discover -s tests -v (17 tests, including mutation cases)
• python scripts/validate_repository.py
• python scripts/sync_product_discovery.py --check --check-cli
• python scripts/build_geo_site.py --check
• pinned Core Skill sync check
• Claude, CodeBuddy, Agent Plugins schema, npm dry-run, four exact-HEAD ZIPs, and universal Skills installation

No real-host or UI automation was run or claimed; this is discovery, routing-contract, generation, and packaging evidence only.

Closes #7