feat: throttle IMDb enrichment and idle retries

[Teagan42]

Summary

• move IMDb fetch helpers into the enrichment stage and add configurable throttling plus idle retry handling
• expose IMDb request window settings through the loader CLI and wrappers while keeping backwards compatibility
• add asynchronous unit tests that exercise retry, rate-limit, and success flows under the new throttling behavior

Testing

• uv run pytest

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https://chatgpt.com/codex/tasks/task_e_68e2c55b1be0832880b295dc76e07560

[chatgpt-codex-connector]

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[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex/loader
__init__.py	761	133	83%	172–179, 228, 314–319, 921–922, 966, 968, 1021–1022, 1033–1035, 1038, 1041–1042, 1044, 1066, 1076, 1087–1119, 1134, 1136, 1143–1157, 1160–1174, 1180, 1195–1226, 1231–1264, 1267–1271, 1276–1284, 1294, 1303, 1307–1309, 1380–1382, 1443–1445, 1803
mcp_plex/loader/pipeline
channels.py	70	2	97%	19–20
enrichment.py	334	44	87%	77, 79, 86, 90, 133–136, 169, 190, 210, 218–220, 227–230, 233–235, 243, 300, 356, 379, 383, 385, 411, 429, 464, 470, 473–481, 507, 531, 602, 605–607
ingestion.py	81	8	90%	67, 98–108, 129, 157, 179
mcp_plex/server
__init__.py	614	29	95%	43–44, 119–120, 148, 252, 256, 277–280, 297, 362, 365, 402, 420–421, 458, 1109, 1131–1137, 1173, 1191, 1196, 1214, 1338, 1375
__main__.py	4	4	0%	3–8
config.py	48	7	85%	50, 52–55, 65, 76
TOTAL	2122	227	89%

Tests	Skipped	Failures	Errors	Time
118	0 💤	0 ❌	0 🔥	57.612s ⏱️