bootstrap: freeze March 8 release path and evidence tooling

docs/decisions/2026-02-26-resetdata-model-freeze.md

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+# DR: ResetData Model Freeze for March 8 Bootstrap Release
+
+Date: February 26, 2026
+Status: Accepted
+Scope: March 8 bootstrap release window
+
+## Decision
+
+Freeze the release model pair to:
+
+- Primary: `openai/gpt-oss-120b`
+- Fallback: `zai-org/glm-4.7-fp8`
+
+## Why
+
+- Both models were validated live against `https://app.resetdata.ai/api/v1/chat/completions` with HTTP 200.
+- `penai/gpt-oss-120b` returned `model_not_found`; remove ambiguity and standardize on known-good IDs.
+- Existing compose defaults already used `openai/gpt-oss-120b`; align Go default to the same model.
+
+## Validation snapshot
+
+Probe run date: February 26, 2026 (UTC)
+
+- `zai-org/glm-4.7-fp8` -> 200
+- `openai/gpt-oss-120b` -> 200
+- `penai/gpt-oss-120b` -> 404 (`model_not_found`)
+- `meta/llama-3.1-8b-instruct` -> 200
+- `google/gemma-3-27b-it` -> 200
+
+## Implementation updates
+
+- Updated Go default model:
+  - `pkg/config/config.go`
+- Updated bootstrap gate validations:
+  - `testing/march8_bootstrap_gate.sh`
+- Updated release board:
+  - `docs/progress/MARCH8-BOOTSTRAP-RELEASE-BOARD.md`
+
+## Consequences
+
+- All release validation and e2e runs must use the frozen pair until March 8, 2026.
+- Any model change before release must open a new decision record and rerun live gate + evidence capture.
+
+## UCXL reference
+
+`ucxl://arbiter:release-coordinator@CHORUS:march8-bootstrap/#/docs/decisions/2026-02-26-resetdata-model-freeze.md`