Add task categories and relevant tags to metadata

This PR adds relevant `task_categories` (`text-generation`, `code-generation`, `code-understanding`) and `tags` (`diff-understanding`, `benchmark`) to the dataset card metadata for improved discoverability on the Hugging Face Hub. The existing Arxiv paper link in the content is maintained as per the explicit guidelines.

README.md

@@ -1,4 +1,11 @@
 ---
+task_categories:
+- text-generation
+- code-generation
+- code-understanding
+tags:
+- diff-understanding
+- benchmark
 dataset_info:
   features:
   - name: repo
@@ -57,44 +64,44 @@ multiple diff representations (`udiff`, `udiff-h`, `udiff-l`, and `search-replac
 
 These formats enable evaluation of LLM capabilities on three code editing tasks:
 
-- **Apply**: Given old code and diff, generate new code
-- **Anti-Apply**: Given new code and diff, generate old code
-- **Diff-Generation**: Given old and new code, generate the diff
+-   **Apply**: Given old code and diff, generate new code
+-   **Anti-Apply**: Given new code and diff, generate old code
+-   **Diff-Generation**: Given old and new code, generate the diff
 
 ## How it's built
 
 Examples were systematically filtered from CommitPackFT to ensure high quality:
 
-- **Scope**: Single-file changes only, excluding binary files, vendor directories, and generated code
-- **Quality**: Removed trivial changes (whitespace-only) and likely test files
-- **Size**: Required 40+ lines in at least one version of the code (old or new); excluded very large files (1000+ lines)
-- **Sampling**:
-    - Target 50/50 split between single-hunk and multi-hunk edits (hunks counted via `@@` markers in the unified diff).
-    - Within each hunk group, stratify by change size (lines added + removed) using the 40th/80th percentiles of that
-      group, targeting ≈40% small, 40% medium, 20% large.
-    - Cap examples to ≤5 per repository per language.
+-   **Scope**: Single-file changes only, excluding binary files, vendor directories, and generated code
+-   **Quality**: Removed trivial changes (whitespace-only) and likely test files
+-   **Size**: Required 40+ lines in at least one version of the code (old or new); excluded very large files (1000+ lines)
+-   **Sampling**:
+    -   Target 50/50 split between single-hunk and multi-hunk edits (hunks counted via `@@` markers in the unified diff).
+    -   Within each hunk group, stratify by change size (lines added + removed) using the 40th/80th percentiles of that
+        group, targeting ≈40% small, 40% medium, 20% large.
+    -   Cap examples to ≤5 per repository per language.
 
 ## Dataset Statistics
 
-- **Total examples:** 1,000
-- **Languages:** Python (200), JavaScript (200), Java (200), Kotlin (200), Rust (200)
+-   **Total examples:** 1,000
+-   **Languages:** Python (200), JavaScript (200), Java (200), Kotlin (200), Rust (200)
 
 **Hunks:**
 
-- **1 hunk:** 500 (50.0%)
-- **2+ hunks:** 500 (50.0%)
+-   **1 hunk:** 500 (50.0%)
+-   **2+ hunks:** 500 (50.0%)
 
 **Change size (added + removed), stratified within hunk groups:**
 
-- **Small** (≤40th pct): 424 (42.4%)
-- **Medium** (40th–80th): 388 (38.8%)
-- **Large** (>80th): 188 (18.8%)
+-   **Small** (≤40th pct): 424 (42.4%)
+-   **Medium** (40th–80th): 388 (38.8%)
+-   **Large** (>80th): 188 (18.8%)
 
 **Change type:**
 
-- **Mixed** (additions + deletions): 815 (81.5%)
-- **Add-only:** 163 (16.3%)
-- **Delete-only:** 22 (2.2%)
+-   **Mixed** (additions + deletions): 815 (81.5%)
+-   **Add-only:** 163 (16.3%)
+-   **Delete-only:** 22 (2.2%)
 
 **Repository diversity:** 891 unique repositories.
 
@@ -117,4 +124,4 @@ Examples were systematically filtered from CommitPackFT to ensure high quality:
 | `udiff`          | string | Standard unified diff (1-line context, numeric hunk headers)           |
 | `udiff-h`        | string | Unified diff with relaxed hunk headers written as `@@ ... @@`          |
 | `udiff-l`        | string | Unified diff with explicit line markers: `ADD`, `DEL`, and `CON`       |
-| `search-replace` | string | Search/replace representation: pairs of `SEARCH`/`REPLACE` edit blocks |
+| `search-replace` | string | Search/replace representation: pairs of `SEARCH`/`REPLACE` edit blocks |