Decisions

Scope Decision

Stage four is limited to Composer final-answer generation and routing.

Reason: Gatekeeper and Verifier contracts were stabilized in earlier stages; this phase should only close the final-expression path.

Composer Responsibility

Composer is an expression layer, not a diagnosis layer.

It may rephrase and organize only filtered material. It must not call tools, introduce new facts, rejudge root cause, or read raw Executor/tool output.

Filtering Decision

ChatService owns Composer input filtering:

Verifier classification	Composer handling
`direct_observation`	`allowed_claims`
`reasonable_inference`	`allowed_claims`, with bounded wording
`overstated`	`allowed_hypotheses` or `missing_info`
`unsupported`	`missing_info`
`external_unknown`	`missing_info`
`contradicted`	`missing_info` / REJECT-safe output

For REJECT, allowed_hypotheses is always empty.

Fallback Decision

Malformed Composer output falls back to deterministic rendering from filtered Composer input.

Fallback must never expose:

raw Composer JSON;
raw Executor JSON;
Executor user_facing_answer;
full unscreened tool output.

Audit Decision

No new table is added. Composer output is persisted under:

diagnosis_session.self_evaluation.verifier_evaluation.composer_output

The audit snapshot is intentionally compact and stores status plus parsed user-facing fields.

Apply Fix Record

Initial targeted verification exposed test drift:

test file had a UTF-8 BOM and failed Java compilation;
scripted chat model did not recognize COMPOSER_TEST_PROMPT;
older tests expected three-Agent execution and temporary V2 renderer behavior;
LOW_CONFID assertions required indirect support to disappear instead of appearing as a possible direction.

Resolution: remove BOM, add Composer script branch, and update assertions to match the committed Composer contract.

Interface Impact

L2 internal behavior change:

external Chat API still returns a final answer string;
internal final-answer source changes from Executor/temporary renderer to Composer or safe fallback;
audit JSON gains composer_output under existing self_evaluation.

No database schema change.

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