Add context snapshot and drop duplicate MLFS metadata

ai/context.md

@@ -0,0 +1,19 @@
+# Repository Context Snapshot
+
+- `README.md`, `docs/ARCHITECTURE.md`, and `docs/METADATA_PIPELINE.md` describe
+  the crate structure, CLI entry points, and metadata workflows. Consult them
+  first when revisiting the project.
+- `metadata_indexer` now supports a `refresh` command that pulls jhalfs
+  `wget-list`/`md5sums` manifests into `ai/metadata/cache/` and the `harvest`
+  command automatically draws URLs and checksums from those manifests.
+- AI state lives under `ai/`:
+  - `ai/personas.json`, `ai/tasks.json`, `ai/bugs.json` track personas,
+    outstanding work, and known issues.
+  - `ai/metadata/` stores package records plus the JSON schema.
+  - `ai/notes.md` captures ongoing research ideas (e.g., deeper BLFS/GLFS
+    manifest coverage).
+- Duplicate MLFS metadata entries were pruned (`binutils-pass1.json` removed in
+  favour of the `binutils-pass-1.json` slug).
+
+This file is intended as a quick orientation checkpoint alongside the richer
+architecture docs.