fix: output HUD as plain text to prevent TUI rendering buffer collisions

[ComBba]

Summary

• Remove all ANSI codes from HUD output (no more \x1b[2m/\x1b[22m dim wrapper)
• HUD line is now pure plain text appended to output
• Strip regex updated: pattern-based matching instead of ANSI code anchors

Root Cause

ANSI dim codes caused the TUI renderer to miscalculate text positions during the transition from streaming deltas to final text. Response text fragments appeared garbled within the HUD line (e.g., "Sisyphus can |", "clau neede-opus-4-6").

Test

• 337 tests pass
• Build + typecheck clean

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📥 Commits

Reviewing files that changed from the base of the PR and between b077984 and 321516e.

📒 Files selected for processing (3)

• src/plugin.ts
• tests/build-usage-line.test.ts
• tests/plugin-api-usage.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/plain-text-hud-no-ansi

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