[JacobStephens2]

Summary

Harness decoder
  parse one event → progress + semantic evidence
    Interpretation
      ordered observed Models
      optional Security Model progress and sticky refusals
      existing completion and retained-record reconciliation

Concentrate live protocol predicates in the existing dialect decoders for all six Harnesses. Keep Interpretation's caller interface and existing Session outcomes.

Closes #640

Evidence

• Before: Interpretation sent each raw line to the decoder and separate Model/Security observers. The added assistant-attribution fixture passed against that implementation (cargo test --bin thirdshift harness::interpretation_tests: 13 passed), establishing behavior to preserve.
  After: the decoder returns an owned StreamUpdate; shared Model and Security policy contains no JSON parsing or Harness selection. cargo test --bin thirdshift harness::: 134 passed.
• cargo check --all-targets, cargo fmt --check, and cargo clippy --all-targets -- -D warnings: passed.
• Session recording regressions: 11 passed. The delegated-attribution Run notification, requested Codex Model across Resume, and refused Security reproduction regressions each passed by their exact test names.
• SYSTEMD_UNIT_PATH=/usr/lib/systemd/system:/lib/systemd/system cargo test: 1713 passed, 1 existing test ignored, 0 failed across 41 test binaries.
• Plain cargo test encountered a warning from this machine's unrelated /etc/systemd/system/career-dashboard-secrets.service in site_deploy::the_systemd_units_verify. The test and deployment units are unchanged from main; the exact test passed when systemd lookup was restricted to vendor units. The complete-suite command above uses that same environment isolation.

Test seams

• Existing Interpretation interface: condense, observed_models, for_security, and finish, exercised through real Harness adapters.
• Existing Session recording, Run notification, and Security-run regressions retain their lifecycle coverage.

Review

Independent Standards and Spec reviews against main at 86c3efc: 0 findings on each axis. Each reviewer read all nine changed files. Changed files left unread: none.

Unaddressed findings

Standards

None.

Spec

None.

Merge Danger

Door: two-way

Reversible internal refactor; no migration or new dependency.

Blast Radius: Sessions

All six Harnesses use this decoder interface for live progress and evidence.

Built with codex · gpt-6.1-sol · high