[Cleanup] formatter.py — 3 dead print methods (~142 lines) and 8 collapsible log-strip regexes

What

swarms/utils/formatter.py (987 lines) carries three public methods with zero callers and a hardcoded regex block that collapses to two patterns.

1. Dead print methods (142 lines)

Verified 0 hits across swarms/, tests/, and examples/:

Method	Lines	Span
print_progress	28	487-514
print_panel_token_by_token	35	515-549
print_plan_tree	79	750-828

2. print_markdown is a redundant alias (21 lines)

print_markdown (:446-466) is used only by tests/utils/test_formatter.py:120 — no production caller. Its body is self.markdown_handler.render_markdown_output(content, title, border_style), which is identical to the print_panel markdown branch at :434-437. Either delete it and update the test, or keep it as a documented one-line alias.

3. _clean_output — 8 near-identical regexes (~30 lines)

MarkdownOutputHandler._clean_output (:39-113) hardcodes eight re.sub log-stripping patterns at :44-79 that differ only by the log level name (INFO, DEBUG, WARNING, ERROR, …).

These collapse to two regexes using an alternation group, e.g. (?:INFO|DEBUG|WARNING|ERROR|SUCCESS|TRACE|CRITICAL). Besides being ~30 lines shorter, it removes the failure mode where a new log level is added and silently isn't stripped.

Broader note

Between this file and agent.py, the codebase has four bespoke panel printers sharing a ~12-line skeleton (_visualize_function_call, _visualize_handoff_call, pretty_print, print_dashboard in agent.py). That consolidation is tracked in the "smaller clones" issue.

Scope

• Delete print_progress, print_panel_token_by_token, print_plan_tree
• Resolve print_markdown (delete + update test, or document as an alias)
• Collapse the 8 log-strip regexes into 2 with an alternation group
• Add a _clean_output test covering every log level, so the alternation is verifiably complete

Context

From the code-waste audit (experimental/CODE_WASTE_AUDIT.md, section 1.10).

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