refactor: sweep dead-code cluster — unused Graph query API, vestigial installers, orphaned helpers (BE-4354)

[mattmillerai]

ELI-5

Some code in comfy-cli was written but never actually used anywhere — a handful of
query helpers on the CQL Graph, two installer methods, a couple of module-level
helper functions, and a commented-out TODO block. Nothing calls them. This PR
deletes that dead code (~100 lines removed) so the codebase carries less unused
surface. Git history keeps it if it's ever wanted again.

What & why

Dead-code cluster sweep (BE-4354). Every deleted symbol was re-verified as
zero-reference by a word-boundary grep across the whole repo (*.py, *.toml,
*.md) immediately before deletion, and cql/engine.py was confirmed to contain no
getattr/__getattr__ dynamic dispatch that could reach the Graph methods.

Deleted:

• cql/engine.py Graph: pack_nodes, label_nodes, cloud_disabled_nodes,
  api_nodes, output_nodes, known_labels. The live siblings
  (cloud_enabled_nodes, packs, downstream, find_paths) are untouched.
• standalone.py: install_comfy_cli, install_comfy (both orphaned; the
  StandalonePython class stays live via other paths).
• cmdline.py: validate_comfyui (plain function, no decorator, no callers) and
  the commented-out scan_dir # TODO: Move this to proper place block.
• update.py: get_version_from_pyproject.
• ui.py: prompt_autocomplete.
• utils.py: install_conda_package.
• env_checker.py: EnvChecker.is_isolated_env (get_isolated_env stays).
• cql/errors.py: CQLRuntimeError.as_details.

Judgment calls (consequential cleanups beyond the ticket's literal list)

To keep the tree lint-clean and free of code my own deletions orphaned:

• standalone.py run_comfy_cli — its only caller was the deleted install_comfy,
  so it became zero-reference; removed it too.
• Now-unused imports removed: update.py from importlib.metadata import metadata;
  utils.py subprocess, typer, and the rprint as print shim — each was used
  only by a function deleted here. ruff check on the changed files passes with these
  removed.

Testing

• ruff check + ruff format --check on all changed files: clean. (The 16
  pre-existing UP038 errors in the untouched workflow_to_api.py are unrelated to
  this PR.)
• Full suite: uv run --extra dev pytest -q → 2769 passed, 37 skipped (exit 0).

Note on the negative-claim/falsification check: this is a pure deletion of unused
code. No user-reachable capability is denied — the removed symbols had zero call sites,
so no product path invoked them.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 744900d2-6c92-4d07-ae70-99b7f007aad4

📥 Commits

Reviewing files that changed from the base of the PR and between 85b62da and bbc308c.

📒 Files selected for processing (8)

• comfy_cli/cmdline.py
• comfy_cli/cql/engine.py
• comfy_cli/cql/errors.py
• comfy_cli/env_checker.py
• comfy_cli/standalone.py
• comfy_cli/ui.py
• comfy_cli/update.py
• comfy_cli/utils.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch matt/be-4354-dead-code-sweep

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch matt/be-4354-dead-code-sweep

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[github-actions]

🔍 Cursor Review — Consolidated panel

Triggered by @mattmillerai.

✅ No high-signal findings.

Panel: 6/8 reviewers contributed findings.

Reviewers that did not contribute: kimi-k2.5:adversarial (empty), kimi-k2.5:edge-case (empty)