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_000000000007803f.go

@@ -0,0 +1,15 @@
+// Code generated by modernc.org/undup from the per-target sqlite_*.go files; DO NOT EDIT.
+
+//go:build (darwin && amd64) || (darwin && arm64) || (freebsd && 386) || (freebsd && amd64) || (freebsd && arm) || (freebsd && arm64) || (openbsd && amd64) || (openbsd && arm64) || (windows && (amd64 || arm64)) || (windows && 386)
+
+package sqlite3
+
+type Tfpos_t = int64
+
+const __INT_FAST16_MAX__ = 32767
+
+const __INT_FAST16_WIDTH__ = 16
+
+const __UINT_FAST16_MAX__ = 65535
+
+type t__gnuc_va_list = uintptr