Add task reliability ledger for publish-gate and Leonard scoring

docs/operations/task-reliability-ledger.md

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+# Task Reliability Ledger
+
+**Purpose:** Make the ≥100 error-free executions rule and Leonard scoring **measurable**.  
+Until a task type has documented runs, human approval remains required before any client-facing publish for that task type.
+
+**Error definition (default):** Output that invents facts/numbers, mis-assigns Evidence Tier, includes solution language in Layer 1/2, omits required Snapshot Date / recency, violates template structure, or would be unsafe to show a client without correction.
+
+---
+
+## Publish-gate counters (automation eligibility)
+
+| task_type | runs | errors | last_error_date | notes |
+|-----------|------|--------|----------------|-------|
+| gbp_snapshot_ingest_r1_r3 | 0 | 0 | — | Leonard execution card only |
+| data_inventory_draft_l1a | 0 | 0 | — | Public baseline |
+| threat_register_draft_l2 | 0 | 0 | — | Diagnosis only |
+| review_reply_draft | 0 | 0 | — | Not auto-publish |
+| gbp_field_edit_draft | 0 | 0 | — | Not auto-publish |
+| qa_answer_draft | 0 | 0 | — | Not auto-publish |
+
+**Rule:** A task_type may bypass human approval **only after** ≥100 completed runs with **zero errors** for that exact task_type, documented here. Reliability does not transfer across task types.
+
+---
+
+## Leonard / agent scored runs (rubric 0–2 × 5 criteria)
+
+| date | agent | client | task_type | score_total | zeros? | pass? | reviewer | notes |
+|------|-------|--------|-----------|-------------|--------|-------|----------|-------|
+| — | — | — | — | — | — | — | — | No scored runs yet |
+
+**Pass:** no zeros and total ≥ 7/10.
+
+---
+
+## How to log a run
+
+1. After human review of an agent draft, add one row to the appropriate table.
+2. If the draft required material correction for an error (see definition), increment `errors` and set `last_error_date`.
+3. Do not count unscored exploratory chat as a run.
+
+**Last updated:** 2026-08-02