fix(generate): use advanced image saver

[christian-byrne]

Summary

• emit SaveImageAdvanced for partner image workflows instead of legacy SaveImage
• set the canonical PNG format explicitly alongside the existing filename prefix
• preserve op-materialization and API-to-frontend round-trip coverage for the advanced node

This makes workflows built through the in-app agent's generate_workflow primitive use the org's canonical Save Image (Advanced) node.

Validation

• uv run pytest tests/comfy_cli/command/generate/test_emit.py tests/comfy_cli/command/generate/test_emit_ops.py — 64 passed
• uv run ruff check .
• uv run ruff format --check .
• full suite: 7,817 passed, 32 skipped; 46 unrelated baseline/environment failures in run preflight fixtures, rich TTY rendering, and filesystem umask semantics

Closes PM-1100.

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📥 Commits

Reviewing files that changed from the base of the PR and between 64026d2 and 1ae1c54.

📒 Files selected for processing (3)

• comfy_cli/command/generate/emit.py
• tests/comfy_cli/command/generate/test_emit.py
• tests/comfy_cli/command/generate/test_emit_ops.py

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📝 Walkthrough

Walkthrough

Image workflow generation now emits SaveImageAdvanced with explicit image, filename prefix, and PNG format inputs. Tests update workflow, operation-generation, deprecation, and round-trip expectations.

Changes

Image output emission

Layer / File(s)	Summary
Advanced output generation comfy_cli/command/generate/emit.py	Documentation and image workflow generation now use SaveImageAdvanced. The generated node receives the image link, filename prefix, and PNG format.
Advanced output validation tests/comfy_cli/command/generate/test_emit.py, tests/comfy_cli/command/generate/test_emit_ops.py	Tests now validate SaveImageAdvanced, its format options and IMAGE output, filename prefixes, deprecation handling, and round-trip output links.

Suggested reviewers: annehe9

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 1ae1c

Image workflows now emit the advanced PNG-saving node with preserved filename prefixes, with matching workflow and round-trip coverage. No merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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