fix: correct jq path for PAI version in statusline script

[pybe]

Summary

• Fixed jq path mismatch in statusline-command.sh that caused incorrect version display
• Changed .pai.version to .paiVersion to match what install.ts writes

Problem

The statusline script was reading from .pai.version in settings.json, but install.ts writes the version to .paiVersion at the root level. This caused the statusline to always show the fallback version ("2.0" or "—") instead of the actual installed version.

Solution

Updated the jq query on line 94 in all three copies of the script:

• .claude/statusline-command.sh
• Releases/v2.3/.claude/statusline-command.sh
• Packs/pai-statusline/src/statusline-command.sh

Verification

Tested locally by comparing jq queries:

# Old query returns fallback
jq -r '.pai.version // "2.0"' settings.json  # Returns: 2.0

# New query returns actual version
jq -r '.paiVersion // "2.0"' settings.json   # Returns: 2.3

Test plan

• Verified settings.json has paiVersion at root level
• Tested both jq queries against settings.json
• Confirmed statusline displays correct version after fix

Fixes #446

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