[sofus-common]

Dates the 0.5.0 changelog entry (2026-10-03) after the release checklist in docs/versioning.md:

• check_version.py (and --self-test), test_behavior_check.py, test_edit_guard.py, and both claude plugin validate --strict pass.
• Full 12-case behavior suite on Claude Code and Codex with independent transcript review; targeted re-runs after the final fixes (fix: draft spec and plan for plan-only requests; no extra approval after the last checkpoint #2, fix: apply the no-code-before-plan-approval rule to Standard work #3): Codex feature x3, payment, and payment-build all pass; Claude Code feature, typo, payment x3, and payment-build pass.
• Known limits are listed in the changelog entry.

After merge: tag v0.5.0 on the merge commit and publish a GitHub release.

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