p2: digest with in-sift FIFO, SQLite caches, Honcho context, recover

Dixie is capped (max_inflight 2, queue_depth 8, queue_wait 20s) and
never queued on llama-server. Streaming chat, thinking off, 45s
fallback to clean. Digest and chunk-embedding caches are
content-addressed SQLite (Honcho context is not cached). Recover
uses the guarded Fetcher. guardian-star is refused in code.

dist/sift.toml.example

@@ -24,3 +24,15 @@ listen = "127.0.0.1:8890"
 # [digest]
 # model = "ornith-1.5-9b-uncensored"
 # thinking = false
+# cache = "/var/lib/sift/cache.db"
+#
+# [dixie]
+# chat = "http://dixie.scylla-hammerhead.ts.net:11434/v1/chat/completions"
+# embed = "http://straylight.scylla-hammerhead.ts.net:11437/v1/embeddings"
+# max_inflight = 2
+# queue_depth = 8
+# queue_wait = "20s"
+#
+# [context]
+# honcho = "http://rift.scylla-hammerhead.ts.net:8000"
+# workspaces = ["hermes-fleet"]