docs(mcp): watchface transp/hier, NET_PIC uniqueness, analog pointers

[DivoomDevelop]

Summary

• Documents \ ransp\ (avoid AI-default 0; use 100 for visible layers) and \hier\ (0=auto, 1=bottom, 2=top only) across MCP guides and protocol excerpts.
• Adds NET_PIC family uniqueness table and troubleshooting notes so duplicate image \disp\ rows do not surprise agents.
• Expands analog pointer guidance for \DIVOOM_CLOCK_DISP_SUPPORT_*_POINT_IMAGE\ (131/132/233): shared square \w=h, same \x,y,w,h, center rotation; references ClockId 60012-style exports and updates \watchface_create_local_clock\ / \watchface_patch_local\ tool text.
• Includes \scripts/gen_ocean_analog_dial_assets.py\ for reproducible square-hand bundles.

Test plan

• Skim rendered Markdown on GitHub for broken formatting (tables, bold).
• Confirm \src/index.ts\ tool descriptions still read clearly in MCP clients.
• Optional: regenerate MCP tool JSON bundle if your release process requires it.

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