Add negative act form experiment

docs/experiments.md

@@ -1890,6 +1890,78 @@ cross-pattern reconciliation is justified.
 Artifacts are preserved under
 `artifacts/experiments/explicit_rejection_gold_v0/20260820_qwen35_9b_single_run/`.
 
+## EXP-0035 — Negative Act Form V0
+
+Status: Experimental; successful for form classification with normalization
+limitations
+
+Date: 2026-08-20
+
+EXP-0034 failed because the binary `explicit_action_rejection | none` question
+collapsed materially different negative acts. It missed self-contained
+non-pursuit and promoted personal preference, recommendation and temporary
+non-action to rejection. This isolated follow-up tested only whether those
+evidence-near forms can be distinguished before any normative derivation. It
+does not derive rejection, decision, outcome, topic closure, responsibility or
+protocol status, and EXP-0034 remained unchanged.
+
+The strict output schema contains exactly `observation_id`,
+`negative_act_form` and `normalized_action_text`. The closed form vocabulary is
+`explicit_non_pursuit`, `personal_preference`, `recommendation`,
+`temporary_non_action` and `none`. Non-`none` forms require non-empty normalized
+action text; `none` requires null. Rejection, status, decision, outcome,
+responsibility and other normative fields are forbidden recursively. Local
+context may resolve a candidate observation's pronoun, but the schema contains
+no target relation and the experiment exposes no derivation function.
+
+Gold results:
+
+- NA-01 explicit non-pursuit: PARTIAL. The form was correct; `working with Dr.
+  Schlummer` omitted the continuation aspect from normalization.
+- NA-02 paraphrased explicit non-pursuit: PASS.
+- NA-03 personal preference: PARTIAL. The form was correct, but normalization
+  repeated `Ich würde das nicht machen` instead of resolving the real-plant
+  trial target.
+- NA-04 negative recommendation: PARTIAL. The form was correct; the normalized
+  English action used the loose rendering `real asset` for `reale Anlage`.
+- NA-05 temporary non-action: PASS.
+- NA-06 concern only: PASS with `none` and null action text.
+- NA-07 uncertainty: PASS with `none` and null action text.
+- NA-08 factual negation: PASS with `none` and null action text.
+
+Expected-versus-actual form confusion was entirely diagonal:
+
+| Expected form | Actual form | Count |
+| --- | --- | ---: |
+| `explicit_non_pursuit` | `explicit_non_pursuit` | 2 |
+| `personal_preference` | `personal_preference` | 1 |
+| `recommendation` | `recommendation` | 1 |
+| `temporary_non_action` | `temporary_non_action` | 1 |
+| `none` | `none` | 3 |
+
+Configuration: exactly eight successful sequential `qwen3.5:9B` calls, one
+per case, temperature 0, `think=false`, `num_ctx=16384`,
+`num_predict=1024`, no retries, no voting and no prompt changes. There were zero
+technical failures. Aggregate runner time was 8.688 seconds; summed per-call
+time was 8.686 seconds, with 4,183 prompt-evaluation tokens and 310 evaluation
+tokens.
+
+The result was five PASS, three PARTIAL and zero FAIL. All eight
+`negative_act_form` classifications matched Gold. There was no unsupported
+semantic strengthening and no rejection, status, decision, outcome,
+responsibility or topic-closure leakage. Normalized action meaning was fully
+acceptable in five cases and imperfect in three.
+
+Conclusion: the finer evidence-near form vocabulary successfully distinguished
+the four semantic boundaries that defeated the binary rejection experiment in
+this small Gold set. The result supports separating negative-act-form
+recognition from later normative derivation, but local target normalization is
+not yet uniformly reliable. It does not justify modifying EXP-0034, deriving
+rejection, production integration or beginning cross-pattern reconciliation.
+
+Artifacts are preserved under
+`artifacts/experiments/negative_act_form_v0/20260820_qwen35_9b_single_run/`.
+
 ## EXP-0026 — Topic-oriented Discussion Subject reconstruction V2 prototype
 
 Date: 2026-08-11