Empty hooks.json causes plugin load failure on Claude Code 2.1+ (financial-analysis, equity-research)

## Bug Description

Two vertical plugins fail to load on Claude Code 2.1+ due to invalid `hooks.json` schema. The files contain an empty array `[]`, but the current Claude Code plugin loader expects either no `hooks/` directory at all or a `hooks.json` containing a valid object (record keyed by hook event name).

## Affected Files

- `plugins/vertical-plugins/financial-analysis/hooks/hooks.json`
- `plugins/vertical-plugins/equity-research/hooks/hooks.json`

Both files currently contain:
```json
[]
```

## Error Message

```
Hook load failed: [
{
"expected": "record",
"code": "invalid_type",
"path": [],
"message": "Invalid input: expected object, received array"
}
]
```

## Reproduction

```bash
claude plugin marketplace add anthropics/financial-services
claude plugin install financial-analysis@claude-for-financial-services
claude plugin install equity-research@claude-for-financial-services
claude plugin list
```

Both plugins show `Status: ✘ failed to load`.

## Environment

- Claude Code version: 2.1.85
- OS: Windows 11

## Suggested Fix

Either:
1. Remove the empty `hooks/` directories from both plugins (simplest — neither plugin actually defines hooks), or
2. Replace file contents with `{}` (empty object instead of empty array)

Option 1 is cleaner since there's no reason to ship an empty hooks file.

## Workaround

Users can manually delete the directories after install:

```bash
rm -rf ~/.claude/plugins/cache/claude-for-financial-services/financial-analysis/0.1.0/hooks
rm -rf ~/.claude/plugins/cache/claude-for-financial-services/equity-research/0.1.0/hooks
```

After this, both plugins load successfully.