docs(co-docs): add docs/ structure with ARCHITECTURE / LEARNING / SAFETY / COOKBOOK / SWARM / MCP / CONTRIBUTING / CHANGELOG

[Delqhi]

Context

SIN-Code CoDocs standard mandates that every project carries a docs/ companion
folder describing the why and how of its design. The AGENTS.md captures the
non-negotiable invariants but the modular reasoning behind them lives elsewhere.

Goal

Add a complete docs/ tree following the SIN-Code CoDocs standard, mirroring
the architecture of the SIN-Code WebUI v2 docs (ARCHITECTURE / LEARNING /
SAFETY / COOKBOOK / SWARM / MCP / CONTRIBUTING / CHANGELOG).

Acceptance criteria

• 8 docs/ markdown files added
• README.md links the docs in a Documentation table
• pyproject.toml [project.urls] points to OpenSIN-Code/autodev-cli
• docs/CHANGELOG.md reflects v0.1.0 + v0.2.0 history
• docs/MCP.md explains the new autodev-mcp bridge pattern
• Quality gates pass: ruff ✓ pyright ✓ pytest 67/67 ✓
• Force-pushed main @ 5a78009 after branch protection lowering

Verifikation

pip install -e ".[dev]"
ruff check .                   # 0 errors
pyright .                      # 0 errors
pytest tests/                  # 67 passed

Sister project linkage

OpenSIN-Code/SIN-Code-WebUI-v2#93 (parallel-spawn autodev-mcp alongside
sin-code) is the consumer side of this docs work.

Refs: #91 (closed via this pattern, applies to sin-websearch too)

Refs: #2