Add contributor-ready adapter starter kit and roadmap

[myheart521]

Outcome

Makes WAMProbe easier to extend and independently reproduce without changing the core evaluation API.

Changes

• add a tested, runnable custom state-future adapter starter and standard report smoke
• add a detailed adapter integration guide and dependency-aware bilingual roadmap
• add structured experiment-result and external-reproduction issue forms
• link contribution paths from English and Chinese READMEs, docs, and CONTRIBUTING
• ship the new source examples and documentation in the sdist
• add labeled follow-up Issues and repository discovery Topics

Validation

• ruff format --check .
• ruff check .
• mypy
• python scripts/validate_repository.py
• mkdocs build --strict
• pytest --cov=wamprobe --cov-report=term-missing --cov-fail-under=85
• 79 tests passed; total coverage 88.35%
• custom adapter smoke generated all four artifacts with zero Top-1 Regret
• uv build
• twine check dist/*

Release gates

This PR does not claim independent reproduction and does not publish v0.1.0. Issue #2 remains the external-user gate.

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