feat: complete license table with 264 packages from bitbake -e extraction

- Replace placeholder CSV (11 rows) with full 264-package inventory
- All SRC_URI URLs fully resolved via bitbake -e (224/264 have URLs)
- 40 packages without URLs are meta-packages/virtual providers
- Add build artifacts (pn-buildlist) and regeneration instructions
- Add .gitignore for __pycache__
- Update README with license distribution summary
- Update Excel import instructions with actual column descriptions

License distribution: MIT (41), GPL-2.0 (32), GPL-2.0+ (22), BSD-3 (19)
Extraction: bitbake -e per recipe, machine=tqma6ul-multi-mba6ulx, distro=spaetzle

docs/05-build-artifacts/README.md

@@ -0,0 +1,44 @@
+# Build Artifacts
+
+## pn-buildlist
+
+Complete list of all 264 BitBake recipes in the `tq-image-small-debug` build graph.
+
+**Machine:** `tqma6ul-multi-mba6ulx`
+**Distro:** `spaetzle` (musl)
+**Yocto:** Scarthgap 5.0.11
+**BitBake:** 2.8.0
+
+## Generating fresh artifacts
+
+```bash
+cd ci-meta-tq
+export ACCEPT_FSL_EULA=1
+export MACHINE=tqma6ul-multi-mba6ulx
+. ./setup-environment build_ut mainline
+
+# Generate dependency graph and build list
+bitbake tq-image-small-debug -g
+
+# Output files:
+# - pn-buildlist          (recipe list)
+# - task-depends.dot      (full dependency graph, ~1.6MB)
+```
+
+## Regenerating the license table
+
+```bash
+# For each recipe in pn-buildlist, extract SRC_URI and LICENSE:
+while IFS= read -r recipe; do
+    output=$(bitbake -e "$recipe" 2>/dev/null)
+    pv=$(echo "$output" | grep '^PV=' | head -1 | sed 's/^PV="//' | sed 's/"$//')
+    license=$(echo "$output" | grep '^LICENSE=' | head -1 | sed 's/^LICENSE="//' | sed 's/"$//')
+    src_uri=$(echo "$output" | grep '^SRC_URI=' | head -1 | sed 's/^SRC_URI="//' | sed 's/"$//')
+    first_url=$(echo "$src_uri" | grep -oP '(https?|ftp|git)://[^\s]+' | head -1 | sed 's/;.*//')
+    echo "\"$recipe\",\"$pv\",\"$license\",\"$first_url\""
+done < pn-buildlist > license-table.csv
+```
+
+---
+
+**Generated:** 2026-03-01