docs: adopt architecture decision records

[Teagan42]

What

• establish an Architecture Decision Record (ADR) directory with an initial record adopting the ADR process
• update contributor guidance to require reviewing and extending ADRs for architectural changes
• bump the project version to 0.26.58 to reflect the new documentation process

Why

• capture architectural decisions so future contributors understand design rationale and avoid conflicting changes

Affects

• repository-wide contributor workflow expectations
• project metadata versioning

Testing

• uv run ruff check .
• uv run pytest

Documentation

• added docs/adr/0001-adopt-architecture-decision-records.md

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https://chatgpt.com/codex/tasks/task_e_68e24a490f8c8328b28eeb6b2635d77b

[Copilot]

Pull Request Overview

This PR establishes an Architecture Decision Record (ADR) process to document design decisions and rationale for future contributors.

• Introduces an ADR directory with an initial record documenting the adoption of the ADR process
• Updates contributor guidance to require ADR review and creation for architectural changes
• Bumps project version to 0.26.58 to reflect the new documentation workflow

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Increments version to 0.26.58
docs/adr/0001-adopt-architecture-decision-records.md	Establishes the ADR process and template
docker/pyproject.deps.toml	Updates version to match main pyproject.toml
AGENTS.md	Adds guidance for contributors to review and create ADRs

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[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex/loader
__init__.py	628	24	96%	201, 256, 258–260, 276, 362–367, 944–949, 1072–1074, 1085–1087, 1099–1101, 1374
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	1496	64	96%

Tests	Skipped	Failures	Errors	Time
100	0 💤	0 ❌	0 🔥	54.221s ⏱️