docs: update gitignore to track report results, add README cross-links

- Revised .gitignore to ignore raw data/cache but track data/report/
  (candidates TSV/Parquet, plots, reproducibility metadata)
- Added zh↔en cross-links between README.md and README.en.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

data/report/reproducibility.md

@@ -0,0 +1,45 @@
+# Pipeline Reproducibility Report
+
+**Run ID:** `5f00f9da-e548-4a58-b1b3-028d05c94d32`
+**Timestamp:** 2026-02-12T18:43:00.223842+00:00
+**Pipeline Version:** 0.1.0
+
+## Parameters
+
+**Scoring Weights:**
+
+- gnomAD: 0.20
+- Expression: 0.20
+- Annotation: 0.15
+- Localization: 0.15
+- Animal Model: 0.15
+- Literature: 0.15
+
+## Data Versions
+
+- **ensembl_release:** 113
+- **gnomad_version:** v4.1
+- **gtex_version:** v8
+- **hpa_version:** 23.0
+
+## Software Environment
+
+- **python:** 3.14.3
+- **polars:** 1.38.1
+- **duckdb:** 1.4.4
+
+## Filtering Steps
+
+| Step | Input Count | Output Count | Criteria |
+|------|-------------|--------------|----------|
+| load_scored_genes | 0 | 0 |  |
+| apply_tier_classification | 0 | 0 |  |
+| write_candidate_output | 0 | 0 |  |
+| generate_visualizations | 0 | 0 |  |
+
+## Tier Statistics
+
+- **Total Candidates:** 18116
+- **HIGH:** 0
+- **MEDIUM:** 2151
+- **LOW:** 15965