Remove trailing whitespace and suppress directive from healer_agent.py

[Copilot]

Addresses code quality feedback on PR #337 to remove trailing whitespace instead of suppressing pylint warnings.

Changes

• Removed 43 instances of trailing whitespace throughout api/agents/healer_agent.py
• Removed trailing-whitespace from pylint disable directive on line 8

-# pylint: disable=trailing-whitespace,line-too-long,too-many-arguments
+# pylint: disable=line-too-long,too-many-arguments

File now passes pylint --enable=trailing-whitespace check cleanly.

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