fix(tape): align tape.search match count with output

[Andy963]

Summary

Fix tape.search output so the reported match count reflects the entries actually
shown after filtering internal tape.search echoes.

This also makes the filtered count explicit even when it is zero.

Changes

• report shown matches with len(lines) instead of raw len(entries)
• report filtered entries as len(entries) - len(lines)
• add focused tests for:
  • filtered entries are counted correctly
  • 0 filtered is shown explicitly

Testing

uv run pytest -q tests/test_tape_search_output.py