chore: prepare 2.0.0a7 prerelease

[Deathcharge]

Summary

• record independent consumer 0.2.12 adoption of the exact merged circuit-breaker contract
• promote package and citation metadata to 2.0.0a7
• prepare the changelog and roadmap for an immutable circuit-breaker prerelease

Verification

• python -m black --check .
• python -m ruff check .
• strict python -m mypy
• python -m pytest (177 passed, 94.73% coverage)
• python -m bandit -q -r src scripts
• isolated sdist-to-wheel build and strict Twine checks
• clean no-dependency wheel install, pip check, canonical/legacy import verification, and installed failed → circuit-open → recovered smoke sequence

Candidate artifacts

• wheel SHA-256: 7d380a133f4883e3c54b4ad5c7e1d67d4511859d4949bed4f564b4fd1e46d296
• sdist SHA-256: f5edc263ca345adfa4c2d60999478c72020fb3f5cf8c31e008e442160c28aead

Adoption evidence

• consumer PR: https://github.com/Deathcharge/samsarix-integration-examples/pull/15
• consumer merge: be56db8476454d6f241a5da7d5e846d92d1bcefb
• exact Core contract: 2744d69eb58aef8412d15fbee9485b6d22eb30a5

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 64043ced-8c0e-45e9-875f-635328a521f1

📥 Commits

Reviewing files that changed from the base of the PR and between 2744d69 and 30118b6.

📒 Files selected for processing (8)

• CHANGELOG.md
• CITATION.cff
• README.md
• ROADMAP.md
• docs/ADOPTION.md
• docs/PRODUCTIZATION.md
• pyproject.toml
• src/samsarix_core/_version.py

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