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adr-pattern-proposal-only-steering-projection

Decision

Institutionalise pattern-proposal-only-steering-projection as a core architectural standard to enforce proposal-only artifact emission without mutating operational branches.

Context

  • Source: governance-flow
  • Pattern: pattern-proposal-only-steering-projection
  • Promotion Recommendation: recommendation-pattern-proposal-only-steering-projection
  • Scope Classification: global
  • Scope Classification Artifact: pattern-scope-classification

Automated architectural projection runs and CI flows risk trunk branch instability if target files are mutated directly. Emitting proposal artifacts ensures human review before change application.

Scope

Applicability: All continuous architecture workflows, automated evaluation steps, and steering projection generators across ideas-to-life-cas and dependent systems.

Global pattern scope applying to continuous architecture steering generation and branch synchronization flows.

Consequences

Governance

Formalizes proposal artifacts as mandatory governance barriers before applying changes to operational steering configurations.

Execution

FlowRunner and steering steps write to designated proposal directories instead of executing direct in-place modifications to repository baselines.

System Behaviour

Automated pipelines produce non-destructive reviewable diffs and artifacts, eliminating unintentional trunk divergence.

Evidence Summary

Promotion Evidence

Ratified Reference Architecture in ArchGov (ID 89) and verified production implementation in src/cas_runner/steps/steering_projection.py.

Promotion Criteria

Satisfied criteria: governance maturity, ratified reference architecture, reusability, evidence quality, and strategic alignment.

Governance Risks

No open governance risks or blocking issues identified during architectural review.

Traceability

Pattern Proposal

pattern-proposal-only-steering-projection

Scope Classification

Artifact: pattern-scope-classification

Classification: global

Promotion Recommendation

recommendation-pattern-proposal-only-steering-projection

Promotion Decision

promotion-decision-pattern-proposal-only-steering-projection

Next Step

  • Submit ADR to Architecture Forum for formal institutionalisation
  • Generate global pattern record in knowledge/global/patterns/