Document target normalization V0 experiment

docs/experiments.md

@@ -2138,6 +2138,55 @@ normalization, but not deriving rejection or integrating a new pipeline.
 Artifacts are preserved under
 `artifacts/experiments/target_resolution_v1_diagnostic/20260820_qwen35_9b_single_run/`.
 
+## EXP-0039 — Target Normalization V0
+
+Status: Experimental; normalization improved but incomplete
+
+Date: 2026-08-20
+
+Target Resolution V1 established correct linkage for all four narrow cases and
+eliminated structural ID failures with deterministic self-linkage, closed ID
+lists, and true JSON Schemas. Its remaining failures were normalization-only.
+This isolated follow-up therefore accepted candidate and target IDs as fixed
+input and tested only reconstruction of the positive German action meaning. It
+contains no target selection, Negative Act classification, eligibility logic,
+rejection derivation, or production integration.
+
+The strict output schema contained exactly `candidate_observation_id`,
+`target_observation_id`, and `normalized_target_text`. Both IDs were constrained
+to their supplied values with JSON Schema `const`; normalized text was a
+non-empty string and null was disallowed. The one fixed prompt required removal
+of negative polarity, preservation of action, continuation, material scope and
+source language, and exclusion of separate alternatives.
+
+| Case | Actual normalized target | Verdict |
+| --- | --- | --- |
+| TN-01 | `Mit Dr. Schlummer zusammenarbeiten` | FAIL: positive polarity and collaboration survived, but continuation was lost |
+| TN-02 | `externe Lösung weiterverfolgen` | PASS |
+| TN-03 | `reale Anlage für den Druckversuch nutzen` | PASS |
+| TN-04 | `Versuch in der realen Anlage durchführen` | PASS; Technikum alternative excluded |
+
+Result: three PASS, zero PARTIAL, one FAIL. All four outputs passed strict
+schema validation and copied both fixed IDs exactly, so changed-ID count was
+zero. Polarity-error count was zero: even TN-01 removed rejection and negation.
+Action/continuation-loss count was one (TN-01); material purpose/location
+scope-loss count was zero; alternative-absorption count was zero. There was no
+unsupported strengthening or normative leakage.
+
+Configuration: exactly four `qwen3.5:9B` calls, temperature 0,
+`think=false`, true JSON Schema, `num_ctx=16384`, `num_predict=1024`, no
+retries, voting, or prompt tuning. Aggregate runner time was 5.066 seconds.
+
+Conclusion: isolating normalization solved the polarity and scoped-action
+failures seen in Target Resolution V1 for three of four cases, including exact
+pressure-test scope and alternative isolation. Continuation semantics remain
+unreliable in the self-contained collaboration case, so Target Normalization
+V0 does not meet its full acceptance criterion. The result does not justify
+rejection derivation or production integration.
+
+Artifacts are preserved under
+`artifacts/experiments/target_normalization_v0/20260820_qwen35_9b_single_run/`.
+
 ## EXP-0026 — Topic-oriented Discussion Subject reconstruction V2 prototype
 
 Date: 2026-08-11