Integrate metadata documentation and jhalfs manifests

ai/notes.md

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+# Integrating jhalfs Source Metadata
+
+- Goal: reuse jhalfs wget-list and md5sums to populate package `source.urls` and
+auto-fill checksums when harvesting metadata for MLFS/BLFS/GLFS packages.
+- Data source: `https://anduin.linuxfromscratch.org/` hosts per-release
+  `wget-list`/`md5sums` files already curated by the jhalfs project.
+- Approach:
+  1. Fetch (and optionally cache under `ai/cache/`) the lists for each book.
+  2. When harvesting, map `<package>-<version>` against the list to gather all
+     relevant URLs.
+  3. Pull matching checksum entries to populate `source.checksums`.
+  4. Keep the existing HTML scrape for chapter/stage text; jhalfs covers only
+     sources.
+- Benefits: avoids fragile HTML tables, keeps URLs aligned with official build
+  scripts, and ensures checksums are up-to-date.