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.

internal/config/config.go

@@ -13,6 +13,28 @@ type File struct {
 	UserAgent    string   `toml:"user_agent"`
 	DenyPrefixes []string `toml:"deny_prefixes"`
 	SelfIP       SelfIP   `toml:"self_ip"`
+	Dixie        Dixie    `toml:"dixie"`
+	Digest       Digest   `toml:"digest"`
+	Context      Context  `toml:"context"`
+}
+
+type Dixie struct {
+	Chat        string `toml:"chat"`
+	Embed       string `toml:"embed"`
+	MaxInflight int    `toml:"max_inflight"`
+	QueueDepth  int    `toml:"queue_depth"`
+	QueueWait   string `toml:"queue_wait"`
+}
+
+type Digest struct {
+	Model    string `toml:"model"`
+	Thinking bool   `toml:"thinking"`
+	Cache    string `toml:"cache"`
+}
+
+type Context struct {
+	Honcho     string   `toml:"honcho"`
+	Workspaces []string `toml:"workspaces"`
 }
 
 // SelfIP is the [self_ip] block.