[Comment accuracy — MEDIUM] "registering the tasks on this same app" is contradicted by call ordering. _verify_pluggable_worker_exists() performs the import_module at builder.py:60, before app = Celery(app_name) is created at builder.py:74. The app object this file uses does not exist yet when the plugin is imported, so registration must go through Celery's deferred binding (@shared_task / connect_on_app_finalize), not a direct attach to "this same app".

Suggested wording: "…runs the plugin's task-registration code. Celery binds those tasks to the worker's app when it finalizes, so the tasks are already registered by this point."

[Comment accuracy — LOW] "otherwise every cloud PG pluggable worker crashes on startup" overstates the guarantee. The attempted relative import with no known parent package crash only fires for plugins whose tasks.py actually uses relative imports; a plugin written with absolute imports would not crash. Suggest softening to the real precondition, e.g. "…which breaks any relative imports in the plugin's tasks.py, so the file-path load must be skipped for pluggable workers."

[Maintainability / rot risk — LOW] This comment hard-codes the internal structure of cloud-only plugin code that is not in this repo (pluggable_worker/ is gitignored in OSS): from . import tasks, from .clients import .... Nobody editing the OSS side can validate these specifics, and they silently rot if a plugin registers tasks differently. Prefer stating the contract ("pluggable workers are proper packages; verification imports pluggable_worker.<type>.worker as a package, running its own task registration incl. relative imports") and marking the concrete from . import ... examples as illustrative ("e.g.").

[Structure / testability — suggestion] Three agents (Simplifier, Test Analyzer, Type-Design) converged here: extract lines 445–490 into a load_worker_tasks(worker_type) helper. Benefits: (1) the giant explanatory comment becomes a proper docstring; (2) nesting collapses from depth 3 to depth 1 via guard-clause returns (impossible at module scope today); (3) it creates the seam for the single highest-value regression test — assert spec_from_file_location is never called when is_pluggable() is True — which permanently pins this fix against a future re-merge of the branches. All locals (base_dir, worker_directory, worker_path, tasks_file, spec, tasks_module) are used only in this block, so extraction leaks nothing. Reasonable to defer as a fast-follow given this is a hotfix.

[Silent failure — MEDIUM] Two zero-task boot paths survive here: (a) this else logs an error but execution continues to the ✅ Successfully loaded line at 492 — a misleading success after a fatal misconfig (pre-existing, just re-indented); (b) after removing the file-path load for pluggable workers, plugin-side import is now the sole task-registration mechanism with no post-check. Celery does not error on an empty task registry — the worker starts and silently processes nothing. Consider one guard after the if/else that covers both paths:

registered = [n for n in app.tasks if not n.startswith("celery.")]
if not registered:
    raise RuntimeError(
        f"No tasks registered for worker '{worker_type.value}' "
        f"(pluggable={worker_type.is_pluggable()}) — worker would start but process nothing."
    )

[Type design — LOW] Deriving the on-disk directory as worker_type.to_import_path().rsplit(".", 1)[0] (line 468) reuses an import-path string as a filesystem path — it only works because every path is "{dir}.tasks". Consider an explicit WorkerType.to_directory() -> str that owns the hyphen/underscore mapping, so intent is named and the mapping lives in one place. (Keep the task-loading logic itself out of the enum — the other WorkerType methods are pure derivations; a load_tasks() would drag sys.path/importlib/the Celery app into a lightweight str, Enum.)

[Nit] import importlib.util is done inside the innermost if. Since os/sys are already imported at module top, moving this up with them is more consistent. Style-only.