feat: ComfyUI->A1111 sampler-name mapping

Implement to_a1111_sampler function that maps ComfyUI (sampler_name, scheduler) pairs
to A1111/Civitai sampler labels. Includes 23 known sampler mappings with fallback to
readable label generation and scheduler-specific handling.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

nodes/civitai_metadata/__init__.py

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+# Civitai metadata engine (comfy-free) — part of ComfyUI-AI2Go-Utils. GPL-3.0.

nodes/civitai_metadata/sampler_names.py

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+# ComfyUI -> A1111 sampler-label mapping — part of ComfyUI-AI2Go-Utils. GPL-3.0.
+#
+# Civitai/A1111 read a sampler *label* (e.g. "DPM++ 2M Karras"). ComfyUI stores a (sampler_name,
+# scheduler) pair. Map the common pairs; fall back to a readable rendering so nothing is lost.
+
+_SAMPLER_LABELS = {
+    "euler": "Euler",
+    "euler_cfg_pp": "Euler",
+    "euler_ancestral": "Euler a",
+    "euler_ancestral_cfg_pp": "Euler a",
+    "heun": "Heun",
+    "heunpp2": "Heun",
+    "dpm_2": "DPM2",
+    "dpm_2_ancestral": "DPM2 a",
+    "lms": "LMS",
+    "dpm_fast": "DPM fast",
+    "dpm_adaptive": "DPM adaptive",
+    "dpmpp_2s_ancestral": "DPM++ 2S a",
+    "dpmpp_sde": "DPM++ SDE",
+    "dpmpp_sde_gpu": "DPM++ SDE",
+    "dpmpp_2m": "DPM++ 2M",
+    "dpmpp_2m_sde": "DPM++ 2M SDE",
+    "dpmpp_2m_sde_gpu": "DPM++ 2M SDE",
+    "dpmpp_3m_sde": "DPM++ 3M SDE",
+    "dpmpp_3m_sde_gpu": "DPM++ 3M SDE",
+    "ddim": "DDIM",
+    "uni_pc": "UniPC",
+    "uni_pc_bh2": "UniPC",
+    "lcm": "LCM",
+}
+
+# Schedulers A1111 treats as the plain sampler (no suffix).
+_PLAIN_SCHEDULERS = {"normal", "simple", "sgm_uniform", "ddim_uniform", "beta", "", None}
+
+
+def to_a1111_sampler(sampler_name, scheduler):
+    base = _SAMPLER_LABELS.get(sampler_name)
+    if base is None:
+        base = sampler_name.replace("_", " ").title() if sampler_name else "Unknown"
+    if scheduler == "karras":
+        return f"{base} Karras"
+    if scheduler == "exponential":
+        return f"{base} Exponential"
+    if scheduler in _PLAIN_SCHEDULERS:
+        return base
+    return f"{base} {scheduler}"  # unknown scheduler: append raw, lose nothing

tests/test_sampler_names.py

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+# Tests for the ComfyUI->A1111 sampler-name mapping — part of ComfyUI-AI2Go-Utils. GPL-3.0.
+from nodes.civitai_metadata.sampler_names import to_a1111_sampler
+
+
+def test_known_pairs():
+    assert to_a1111_sampler("euler", "normal") == "Euler"
+    assert to_a1111_sampler("euler_ancestral", "normal") == "Euler a"
+    assert to_a1111_sampler("dpmpp_2m", "karras") == "DPM++ 2M Karras"
+    assert to_a1111_sampler("dpmpp_2m", "exponential") == "DPM++ 2M Exponential"
+
+
+def test_unknown_sampler_falls_back_readably():
+    assert to_a1111_sampler("brand_new_sampler", "normal") == "Brand New Sampler"
+
+
+def test_unknown_scheduler_appended():
+    assert to_a1111_sampler("euler", "weird_sched") == "Euler weird_sched"
+
+
+def test_empty_inputs():
+    assert to_a1111_sampler("", "") == "Unknown"