Refine Plex alias parsing and document server API typing rules

[Teagan42]

What

• tighten PLEX_PLAYER_ALIASES parsing to accept structured mappings/sequences and normalize them into an immutable alias map
• thread the typed alias map through Plex player discovery and cover the new parsing paths with tests
• document server guidelines requiring typed endpoint models and justification for new Any/object annotations
• bump project version metadata and lockfile entries

Why

• configuration parsing previously accepted object inputs and produced mutable lists, which made the accepted schema unclear and error handling inconsistent
• downstream code now benefits from precise typing, while documentation sets expectations for future endpoints and typing exceptions

Affects

• server configuration parsing, Plex player alias lookups, configuration tests, repository guidelines, and version metadata/lockfile

Testing

• uv run ruff check .
• uv run pytest

Documentation

• Updated mcp_plex/server/AGENTS.md with new API guidelines

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https://chatgpt.com/codex/tasks/task_e_68e4a96e9fbc8328be8083b9ab793a03

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex/common
validation.py	28	2	93%	37–38
mcp_plex/loader
__init__.py	374	17	95%	84–91, 165, 255–260, 662, 777–779, 781, 867–886
__main__.py	4	4	0%	2–8
imdb_cache.py	43	2	95%	59, 63
mcp_plex/loader/pipeline
channels.py	64	2	97%	134–135
enrichment.py	516	75	85%	237, 259–265, 318, 323, 354, 356, 363, 367, 471, 492, 512, 520–522, 525–527, 530–532, 540–545, 553, 607–608, 632, 692–693, 709, 738, 745, 747, 751, 803, 821, 833, 862, 868, 871–879, 905, 908–910, 927–929, 949–952, 956, 970–976, 998, 1000, 1003–1005
ingestion.py	155	13	92%	81, 130–150, 185, 222, 238, 331, 337, 357
orchestrator.py	95	5	95%	63, 141, 170, 193–194
persistence.py	130	9	93%	122, 164–165, 175, 186, 190–192, 245
mcp_plex/server
__init__.py	830	42	95%	164–165, 245–246, 265, 282, 332, 354–355, 365, 445, 466–469, 483–486, 494, 568, 571, 609, 627–628, 666, 1094, 1367, 1390–1398, 1435, 1453, 1459, 1477, 1624, 1664
__main__.py	4	4	0%	3–8
config.py	82	12	85%	58, 61–69, 76, 82, 102, 116
TOTAL	2558	187	93%

Tests	Skipped	Failures	Errors	Time
156	0 💤	0 ❌	0 🔥	1m 28s ⏱️