fix: handle unknown node IDs in comfy run without crashing

[bigcat88]

When workflows use loop/iteration nodes (like ComfyUI-Loop-image or Easy-Use), the ComfyUI server sends websocket messages with composite node IDs like 406.0.0.428 that don't exist in the original workflow dict. This caused comfy run to crash with a KeyError even though the workflow executed successfully and all outputs were saved.

Changed get_node_title() and log_node() to use dict.get() instead of dict[] for workflow lookups. Unknown node IDs now fall back to displaying the raw ID string instead of crashing. The workflow execution itself is unaffected since remaining_nodes.discard() was already safe for unknown keys.

Added tests covering unknown node IDs through all message types (executing, progress, executed, execution_cached) in both normal and --verbose modes.

Fixes #278

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #385      +/-   ##
==========================================
+ Coverage   66.59%   67.04%   +0.44%     
==========================================
  Files          33       33              
  Lines        3706     3711       +5     
==========================================
+ Hits         2468     2488      +20     
+ Misses       1238     1223      -15     

Files with missing lines	Coverage Δ
comfy_cli/command/run.py	73.95% <100.00%> (+7.76%)	⬆️

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