Inconsistent CORE installation location between Bundle and Pack installers

[2b3pro]

The Kai Bundle installer (Bundles/Kai/install.ts) and the kai-core-install Pack (Packs/kai-core-install.md) install CORE to different default locations, potentially creating duplicate CORE directories.

Details

Installer	Default Location	Code Reference
Bundles/Kai/install.ts	~/.claude (hardcoded)	Line 581: const claudeDir = ${process.env.HOME}/.claude`
Packs/kai-core-install.md	$PAI_DIR (defaults to ~/.config/pai)	Line 442: PAI_CHECK="${PAI_DIR:-$HOME/.config/pai}"

Reproduction

1. Run the Kai Bundle installer: bun run Bundles/Kai/install.ts
2. Later install the kai-core-install pack following its instructions
3. Result: Two CORE directories exist:
   - ~/.claude/skills/CORE
   - ~/.config/pai/skills/CORE (or $PAI_DIR/skills/CORE)

Additional Notes

The Bundle installer acknowledges PAI_DIR at lines 312-327 (asks user if they want to use existing PAI_DIR) but then ignores this choice and installs to ~/.claude anyway.

Suggested Resolution

Options to consider:

1. Align defaults - Both installers use the same default location
2. Respect PAI_DIR everywhere - Bundle installer should use PAI_DIR if set
3. Detection - Pack installer checks for existing CORE in ~/.claude before creating another