fix(skills/comfyui): bug fixes, cloud parity, expanded coverage, examples, tests

The audit of v4.1 surfaced ~70 issues across the five scripts and three
reference docs — most user-visible (silent file overwrites, status-error
misclassified as success, X-API-Key leaked to S3 on /api/view redirect,
Cloud endpoints that 404 because they were renamed). v5.0.0 fixes those
and fills the gaps that previously forced users to write their own glue
(WebSocket monitoring, batch/sweep, img2img upload helper, dep auto-fix,
log fetch, health check, example workflows).

Critical fixes
- run_workflow.py: poll_status now checks status_str==error BEFORE
  completed:true, so a failed run no longer reports success
- run_workflow.py: download_output streams to disk via safe_path_join,
  preserves server subfolder structure (no silent overwrites), and
  retries with exponential backoff
- run_workflow.py: refuses to overwrite a link with a literal in
  inject_params (would silently break wiring)
- _common.py: _StripSensitiveOnRedirectSession (subclasses
  requests.Session.rebuild_auth) drops X-API-Key/Cookie on cross-host
  redirects — fixes a real key-leak path through Cloud's signed-URL
  download flow. Tested
- Cloud routing (verified live): /history → /history_v2,
  /models/<f> → /experiment/models/<f>, plus folder aliases for the
  unet ↔ diffusion_models and clip ↔ text_encoders rename
- check_deps.py: distinguishes 200/empty vs 404 folder_not_found vs
  403 free-tier; emits concrete fix_command per missing dep
- extract_schema.py: prompt vs negative_prompt determined by tracing
  KSampler.{positive,negative} connections (incl. through Reroute /
  Primitive nodes) instead of meta-title heuristic; symmetric
  duplicate-name resolution; cycle-safe trace_to_node
- hardware_check.py: multi-GPU pick-best, Apple variant detection,
  Rosetta detection, WSL2, ROCm --json, disk-space check, optional
  PyTorch probe; powershell preferred over deprecated wmic
- comfyui_setup.sh: prefers pipx → uvx → pip --user (with PEP-668
  fallback); idempotent — skips relaunch if server already up;
  configurable port/workspace; persistent log; SIGINT trap

New scripts
- run_batch.py — count or sweep (cartesian product), parallel up to
  cloud tier limit
- ws_monitor.py — real-time WebSocket viewer; saves preview frames
- auto_fix_deps.py — runs comfy node install / model download for
  whatever check_deps reports missing (with --dry-run)
- health_check.py — single command that runs the verification checklist
  (comfy-cli + server + checkpoints + optional smoke test that cancels
  itself to avoid burning compute)
- fetch_logs.py — pull traceback / status messages for a prompt_id

Coverage expansion
- Param patterns now cover Flux (BasicScheduler, BasicGuider,
  RandomNoise, ModelSamplingFlux), SD3, Wan/Hunyuan/LTX video,
  IPAdapter, rgthree, easy-use, AnimateDiff
- Embedding refs in CLIPTextEncode strings extracted as model deps
- ckpt_name / vae_name / lora_name / unet_name now controllable so
  workflows can be retargeted per run

Examples
- workflows/{sd15,sdxl,flux_dev}_txt2img.json
- workflows/sdxl_{img2img,inpaint}.json
- workflows/upscale_4x.json
- workflows/{animatediff_video,wan_video_t2v}.json + README

Tests
- 117 tests (105 unit + 8 cloud integration + 4 cross-host security)
- Cloud tests auto-skip without COMFY_CLOUD_API_KEY; verified end-to-end
  against live cloud API

Backwards compatibility
- All existing CLI flags continue to work; new behavior is opt-in
  (--ws, --input-image, --randomize-seed, --flat-output, etc.)

skills/creative/comfyui/tests/README.md

@@ -0,0 +1,50 @@
+# ComfyUI Skill Tests
+
+Pytest suite covering the skill's scripts. Pure-stdlib unit tests run
+without any setup; cloud integration tests need a Comfy Cloud API key.
+
+## Running
+
+```bash
+# Unit tests only (no network required) — runs in <1s
+python3 -m pytest tests/ -c tests/pytest.ini -o addopts="-p no:xdist"
+
+# Including cloud integration tests
+COMFY_CLOUD_API_KEY="comfyui-..." python3 -m pytest tests/ \
+  -c tests/pytest.ini -o addopts="-p no:xdist"
+
+# Just cloud tests
+COMFY_CLOUD_API_KEY="comfyui-..." python3 -m pytest tests/test_cloud_integration.py \
+  -c tests/pytest.ini -o addopts="-p no:xdist" -v
+```
+
+The `-c` and `-o` overrides isolate this suite from any parent
+`pyproject.toml` pytest config (e.g. the `-n auto` from a parent repo).
+
+## Test files
+
+| File | Coverage |
+|------|----------|
+| `test_common.py` | Cloud detection, URL routing, format validation, embeddings, paths, seeds, model-list parsing, folder aliases |
+| `test_extract_schema.py` | Connection tracing, positive/negative prompt detection, dedup logic, embedding deps |
+| `test_run_workflow.py` | Param injection (incl. -1 seed, link refusal), output download walk, runner construction |
+| `test_check_deps.py` | Model-name fuzzy matching, install command suggestions |
+| `test_cloud_integration.py` | Live cloud API contract tests (auto-skipped without API key) |
+
+## Adding tests
+
+When you change a script:
+
+1. Add a unit test if the change is pure logic (cloud detection, parsing, etc.)
+2. Add a cloud integration test if the change depends on cloud API behavior
+   (use `pytestmark = pytest.mark.cloud` so it auto-skips without a key)
+3. Workflow fixtures live in `conftest.py` (`sd15_workflow`, `flux_workflow`,
+   `video_workflow`)
+
+## Why the explicit `-c` / `-o`?
+
+The parent hermes-agent repo's `pyproject.toml` enables `pytest-xdist` by
+default (`-n auto`). This suite is small enough that parallelism isn't
+worth the complexity, and pytest-xdist isn't always installed in the user's
+environment. The `-c tests/pytest.ini -o addopts="-p no:xdist"` flags make
+the suite run identically regardless of the parent project's config.