Add collective commitment gold experiment

docs/experiments.md

@@ -1747,6 +1747,70 @@ additional semantic category is justified by this result.
 Artifacts are preserved under
 `artifacts/experiments/request_acceptance_gold_v0/20260820_qwen35_9b_single_run/`.
 
+## EXP-0033 — Collective Commitment Gold V0
+
+Status: Experimental; architecturally successful with one contained
+recognition false positive
+
+Date: 2026-08-20
+
+This isolated second-stage experiment tested whether an explicit collective
+first-person commitment can establish an action without inventing an individual
+owner. It used ten synthetic cases containing one minimal V3-style observation
+each. Evidence Observation V3 was neither called nor changed, and the accepted
+Request/Acceptance mechanism remained unchanged and independent.
+
+The strict semantic schema contains exactly `observation_id`,
+`commitment_form` and `normalized_action_text`. `commitment_form` is closed to
+`individual_first_person`, `collective_first_person` and `none`. The model
+cannot output responsibility, ownership, requested actor, establishment,
+Action Item, protocol, confidence, relations, graphs, decisions or unresolved
+issues. Deterministic code validates schema and provenance, requires collective
+commitment plus non-empty action text, applies bounded deadline consistency and
+explicit-negation gates, and only then sets `status: established`,
+`commitment_scope: collective` and `responsible_person: null`.
+
+Gold results:
+
+- CC-01 explicit collective commitment: PASS; established, due `nächste
+  Woche`, no person.
+- CC-02 individual commitment: PASS; correctly routed out of the collective
+  path.
+- CC-03 tentative collective possibility: PASS; unestablished.
+- CC-04 collective suggestion: PASS; unestablished.
+- CC-05 impersonal necessity: PASS; unestablished.
+- CC-06 passive future statement: PASS; unestablished.
+- CC-07 collective rejection: PARTIAL. The model incorrectly returned
+  `collective_first_person`, but the deterministic negation gate detected
+  `nicht` and prevented establishment.
+- CC-08 qualified collective commitment: PASS; established with `nur im
+  Technikum` preserved, null due and no person.
+- CC-09 collective commitment without deadline: PASS; established with null
+  due and no person.
+- CC-10 speaker ownership trap: PASS; established collectively while Martin
+  remained only the speaker and was not assigned ownership.
+
+Configuration: exactly ten 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 change. There were zero technical failed
+calls. Aggregate runner time was 10.504 seconds; summed per-call time was 10.500
+seconds, with 4,267 prompt-evaluation tokens and 415 evaluation tokens.
+
+The outcome was nine PASS, one PARTIAL and zero FAIL. There was one recognition
+false positive and no recognition false negatives. No qualifier was lost, no
+individual owner was invented, and no responsibility or status field leaked
+into recognition. Bounded due handling preserved `nächste Woche` verbatim and
+returned null when no deadline was present.
+
+Conclusion: the collective-commitment path is architecturally successful for
+this narrow Gold set. The deterministic negation gate contained the only model
+error, and every successful collective result necessarily retained
+`responsible_person: null`. This does not justify a generic commitment system,
+production integration, group identity inference or another semantic category.
+
+Artifacts are preserved under
+`artifacts/experiments/collective_commitment_gold_v0/20260820_qwen35_9b_single_run/`.
+
 ## EXP-0026 — Topic-oriented Discussion Subject reconstruction V2 prototype
 
 Date: 2026-08-11