[ynadge]

Primary change type

• Bug fix

Problem and motivation

Permissive synthetic-part recognition could borrow an earlier Assistant context or completion token for a message that is not a native compaction control.

Summary and scope

Use one shared recognizer matching the native control-message contract across completion tokens, retained record provenance, Resume history selection and final-response recovery. Require text and literal boolean markers for auto-continue; retain ordinary compaction-part support.

Related work

Related issue: https://linear.app/sapiom/issue/SAP-3292

Depends on #1022. Native stack target: main.

Validation

143 focused tests passed, including exact seed regression coverage. Full Harness server/web TypeScript, scoped ESLint and diff checks passed.

Tests and documentation

New behavior cases reject fake tool/file markers and truthy strings; they prove no inherited accepted reference, old Resume context or recovery dispatch. A later real continuation cannot resurrect a reset token. Updated assistant-history.md. Increment:206 changed lines including tests/docs/changeset; SDK pr:size is absent.

Compatibility and release impact

• Real native compaction behavior is preserved; ordinary acknowledgement filtering retains its separate purpose.
• Changeset: @sapiom/harness patch.
• Fix-forward: keep native control recognition consistent across context consumers while correcting provenance handling.

Security

• No secrets, credentials, private data, or unsanitized logs included.
• No suspected vulnerability disclosed publicly.

AI assistance

• AI assistance used: Codex implemented and reviewed the change with the validation described above.

Checklist

• CONTRIBUTING.md read; maintainer-authorized issue work.
• One focused increment, checks, documentation and release impact addressed.
• I can explain and maintain the submitted changes.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.