Fix PowerShell agent CLI wrapper and restore reliable task/initiative list commands

[nike-beep]

Changes

• generate Windows-native wanman.cmd / wanman.ps1 and pnpm.cmd / pnpm.ps1 wrappers instead of a Bash-only shim when the local supervisor creates an agent home on Windows
• use Windows PATH semantics and set USERPROFILE for spawned agent shells so PowerShell sessions inherit the repaired wrapper path correctly
• add focused regression coverage for Windows wrapper generation, environment setup, and local supervisor lifecycle behavior

Verification

• corepack pnpm --filter @wanman/cli test -- --coverage local-supervisor.test.ts
• corepack pnpm --filter @wanman/cli typecheck
• corepack pnpm --filter @wanman/cli... build
• live PowerShell smoke check: wanman recv, wanman task list --assignee dev, wanman initiative list

Test Coverage

• packages/cli/src/local-supervisor.ts: 96.37% statements, 97.22% functions, 98.37% lines from the focused coverage run