docs(bf-4636k): capture pdftract version and commit information

Captured version 0.1.0 from workspace Cargo.toml and commit hash b13db189.
Saved to /tmp/pdftract-version-info.txt for downstream bead use.

Closes bf-4636k

notes/bf-4636k.md

@@ -0,0 +1,27 @@
+# bf-4636k: Capture pdftract version and commit information
+
+## What was done
+
+Captured pdftract version and git commit information for debug log header inclusion.
+
+## Results
+
+**Version info captured:**
+- pdftract version: 0.1.0 (from workspace Cargo.toml)
+- git commit: b13db18929f8a9c8b2eeb3357941b690581dfe74
+
+**Output file:** `/tmp/pdftract-version-info.txt`
+
+## Notes
+
+- `pdftract --version` flag is not available; version was extracted from workspace.package.version in `/home/coding/pdftract/Cargo.toml`
+- Git repository was accessible and commit hash retrieved successfully
+- Temp file created and verified to contain both version and commit hash
+- File persists at `/tmp/pdftract-version-info.txt` for use by downstream beads
+
+## Acceptance criteria
+
+- ✅ PASS: pdftract version captured (0.1.0 from Cargo.toml)
+- ✅ PASS: git rev-parse HEAD output captured (b13db18929f8a9c8b2eeb3357941b690581dfe74)
+- ✅ PASS: Both saved to temp file (/tmp/pdftract-version-info.txt)
+- ✅ PASS: File verified to contain both pieces of information