Add batch hardening report for drive and product specs

docs/progress_log_2026-02-26.md

@@ -67,3 +67,8 @@
 - Demonstrated hard-gate delta on sprint sample:
   - original spec blocked (`rc=7`, score `17`)
   - hardened spec passed (`rc=0`, score `100`)
+- Executed batch hardening on real corpora:
+  - drive specs (7)
+  - example product meta specs (10)
+- Batch report:
+  - `docs/spec_hardening_batch_report_2026-02-26.md`

docs/spec_hardening_batch_report_2026-02-26.md

@@ -0,0 +1,55 @@
+# Spec Hardening Batch Report - 2026-02-26
+
+## Scope
+
+Batches executed with:
+- `tools/mcp/run_spec_hardening_gate.sh`
+
+Corpora:
+1. Drive project docs (`/home/bill/Documents/drive_projects/...`) - 7 specs
+2. Example product meta specs (`example_projects/*/PROJECT_META.md`) - 10 specs
+
+## Batch Artifacts
+
+Drive batch:
+- `logs/taskitem_runs/drive_spec_hardening_batch_20260226/results.jsonl`
+- `logs/taskitem_runs/drive_spec_hardening_batch_20260226/summary.json`
+- `logs/taskitem_runs/drive_spec_hardening_batch_20260226/quality_summary.json`
+
+Example project meta batch:
+- `logs/taskitem_runs/example_projectmeta_hardening_batch_20260226/results.jsonl`
+- `logs/taskitem_runs/example_projectmeta_hardening_batch_20260226/summary.json`
+
+## High-Density Outcomes
+
+Readiness/hard-gate behavior:
+- Original specs: all blocked by hard gate (`original_rc=7`)
+- Hardened specs: all passed (`hardened_rc=0`)
+- Readiness scores improved to `100` for all hardened outputs.
+
+Drive batch deltas:
+- before score range: `15..22`
+- after score range: `100..100`
+- delta range: `78..85`
+
+Example product-meta deltas:
+- before score range: `0..8`
+- after score range: `100..100`
+- delta range: `92..100`
+
+## Important Limitation Discovered
+
+Downstream taskitem metrics are currently low-discrimination across both batches:
+- `task_count` consistently `2`
+- `validation.average_score` consistently `87.5`
+- `validation.average_execution_specificity_score` consistently `75.0`
+- `validation.failing_count` consistently `0`
+
+Interpretation:
+- The new planning gate/hardening loop is working as intended for pre-execution quality control.
+- But current sprint pipeline translation quality signal is too flat for heterogeneous product specs.
+- Next required work: increase spec-to-taskitem semantic sensitivity (more variable decomposition and specificity based on domain constraints).
+
+## Recommendation
+
+Use real specs first (drive + product metas), then generate synthetic specs only to cover missing domains after translation-sensitivity improvements are in place.