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_0000000000023eab.go

@@ -0,0 +1,40 @@
+// Code generated by modernc.org/undup from the per-target sqlite_*.go files; DO NOT EDIT.
+
+//go:build (darwin && amd64) || (darwin && arm64) || (freebsd && amd64) || (freebsd && arm64) || (linux && amd64) || (linux && arm64) || (linux && loong64) || (linux && ppc64le) || (linux && riscv64) || (linux && s390x) || (windows && (amd64 || arm64))
+
+package sqlite3
+
+import (
+	"unsafe"
+
+	"modernc.org/libc"
+)
+
+// C documentation
+//
+//	/*
+//	** The first argument is a file-handle open on a temporary file. The file
+//	** is guaranteed to be nByte bytes or smaller in size. This function
+//	** attempts to extend the file to nByte bytes in size and to ensure that
+//	** the VFS has memory mapped it.
+//	**
+//	** Whether or not the file does end up memory mapped of course depends on
+//	** the specific VFS implementation.
+//	*/
+func _vdbeSorterExtendFile(tls *libc.TLS, db uintptr, pFd uintptr, _nByte Ti64) {
+	bp := tls.Alloc(32)
+	defer tls.Free(32)
+	*(*Ti64)(unsafe.Pointer(bp)) = _nByte
+	var _ /* chunksize at bp+16 */ int32
+	var _ /* p at bp+8 */ uintptr
+	if **(**Ti64)(__ccgo_up(bp)) <= int64((*Tsqlite3)(unsafe.Pointer(db)).FnMaxSorterMmap) && (*Tsqlite3_io_methods)(unsafe.Pointer((*Tsqlite3_file)(unsafe.Pointer(pFd)).FpMethods)).FiVersion >= int32(3) {
+		**(**uintptr)(__ccgo_up(bp + 8)) = uintptr(0)
+		**(**int32)(__ccgo_up(bp + 16)) = libc.Int32FromInt32(4) * libc.Int32FromInt32(1024)
+		_sqlite3OsFileControlHint(tls, pFd, int32(SQLITE_FCNTL_CHUNK_SIZE), bp+16)
+		_sqlite3OsFileControlHint(tls, pFd, int32(SQLITE_FCNTL_SIZE_HINT), bp)
+		_sqlite3OsFetch(tls, pFd, 0, int32(**(**Ti64)(__ccgo_up(bp))), bp+8)
+		if **(**uintptr)(__ccgo_up(bp + 8)) != 0 {
+			_sqlite3OsUnfetch(tls, pFd, 0, **(**uintptr)(__ccgo_up(bp + 8)))
+		}
+	}
+}