Fix Windows Obsidian MCP registration

[OgeonX-Ai]

Summary

• register Obsidian MCP with npx.cmd on Windows so Claude/Gemini do not hit blocked npx.ps1 execution policy
• document canonical Windows profile env, Gemini trust/auth caveat, and Obsidian MCP test expectations

Verification

• npm.cmd test -- tests/register-global.test.ts
• powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\register-global.ps1 -Check -ProfileRoot C:\Users\KimHarjamaki -CodexHome C:\codex-home
• powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\register-global.ps1 -Apply -ProfileRoot C:\Users\KimHarjamaki -CodexHome C:\codex-home
• codex.cmd mcp list
• claude.cmd mcp list with USERPROFILE/HOME set to C:\Users\KimHarjamaki
• gemini.cmd mcp list with USERPROFILE/HOME set to C:\Users\KimHarjamaki
• npm.cmd run release:verify