Find exclude patterns match basenames only, making path-based exclusion impossible

[shellicar]

Current behaviour

The exclude parameter matches directory names by basename. There is no way
to exclude based on path structure.

In practice, every dot directory (.git, .claude, .turbo, etc.) must be
listed individually. A single rule covering all dot directories is not
expressible. If I forget one, its contents appear alongside source files:
.git object files, .claude session logs, mixed in where they do not belong.

Desired behaviour

I can express exclusions based on path structure, and common directories are
excluded by default without listing them individually.

Notes

Specifically about exclude semantics and defaults. The pattern field
already accepts regex and is not affected.

[shellicar]

PR #220 added .git to the default exclusions, which removes one symptom. The core problem (basename-only matching, no way to express a path-based rule covering all dot directories at once) is still open.