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.

vendor/modernc.org/sqlite/lib/sqlite_g_0000000000064003.go

@@ -0,0 +1,17 @@
+// Code generated by modernc.org/undup from the per-target sqlite_*.go files; DO NOT EDIT.
+
+//go:build (darwin && amd64) || (darwin && arm64) || (netbsd && amd64) || (windows && (amd64 || arm64)) || (windows && 386)
+
+package sqlite3
+
+const DOMAIN = 1
+
+const OVERFLOW = 3
+
+const PLOSS = 6
+
+const SING = 2
+
+const TLOSS = 5
+
+const UNDERFLOW = 4