fix: correct hooks.json schema for plugin validation

[dineshsuthar31]

Summary

Fixes invalid hooks/hooks.json schema in multiple vertical plugins.

The affected plugins shipped with:

[]

However, Claude Code expects the hooks file to follow the object schema:
{
"hooks": {}
}

This caused plugin load failures during post-install validation.

Updated Plugins

• financial-analysis
• equity-research
• private-equity
• wealth-management

Changes

Replaced invalid array-based hook placeholders with the expected object schema:
{
"hooks": {}
}

This matches the existing structure already used in the investment-banking plugin.

Result

Plugins now pass hook validation successfully during installation.