Fix JSON tag casing, error handling, and documentation inconsistencies from PR #73 review

[Copilot]

Addresses code review comments from PR #73 on the playbook refactoring work. Fixes struct tag mismatches that would break YAML unmarshaling, improves file I/O error handling, and corrects documentation to match the new params-based format.

Changes

Extractor struct tags - Changed json:"Path" to json:"path" in:

• extractors/tabular_load.go
• extractors/sqldump_step.go

Previously capitalized tags would fail to unmarshal playbooks using lowercase path: keys.

ReadAt error handling - Fixed extractors/transpose_load.go:

// Before: dropped last row on EOF, processed garbage beyond actual bytes
_, err := table.ReadAt(buf, row*stepSize)
tmp := bytes.Split(buf, []byte{0})
if err == nil { ... }

// After: handles EOF correctly, only processes valid bytes
n, err := table.ReadAt(buf, row*stepSize)
if err != nil && err != io.EOF {
    continue
}
if n > 0 {
    tmp := bytes.Split(buf[:n], []byte{0})
    ...
}

IsDir() type checking - Updated config/config.go to recognize both "dir" and "path" types:

func (in *Param) IsDir() bool {
    t := strings.ToLower(in.Type)
    return t == "path" || t == "dir"
}

Documentation corrections:

• Fixed spelling: "Paramaters" → "Parameters" in docs/docs/config.md
• Changed value: to default: in example yaml in docs/docs/inputs/index.md
• Updated transpose schema: input → path in docs/docs/schema.md

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