refactor: drop loader enrichment helper aliases

[Teagan42]

Summary

• stop re-exporting TMDb/Plex enrichment helpers from mcp_plex.loader.__init__
• rely on tests already pulling enrichment helpers from mcp_plex.loader.pipeline.enrichment

Testing

• uv run pytest

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https://chatgpt.com/codex/tasks/task_e_68e353a2a7a88328b1ffac37c9be9801

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex/loader
__init__.py	394	18	95%	127–134, 164, 250–255, 608, 621, 740–742, 806–823, 1165
mcp_plex/loader/pipeline
__init__.py	15	7	53%	57–62, 68
channels.py	73	2	97%	19–20
enrichment.py	430	60	86%	248, 253, 284, 286, 293, 297, 376, 397, 417, 425–427, 434–437, 440–442, 450, 507, 563, 586, 590, 592, 618, 636, 648, 677, 683, 686–694, 720, 723–725, 742–744, 764–767, 771, 785–791, 813, 815, 818–820
ingestion.py	81	8	90%	67, 98–108, 129, 157, 179
orchestrator.py	85	5	94%	48, 112, 141, 164–165
persistence.py	124	9	93%	112, 154–155, 165, 170, 174–176, 214
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	2070	149	93%

Tests	Skipped	Failures	Errors	Time
120	0 💤	0 ❌	0 🔥	46.631s ⏱️