feed: inline handlers, remove FeedBlockingRead wrapper

cmd/olliesrv/internal/agent/agent.go

@@ -680,19 +680,11 @@ func (ag *Agent) FeedWrite(data []byte) {
 	ag.notifyChange()
 }
 
-// FeedBlockingRead blocks until feed data differs from base.
-// Returns the data and a nextBase for the caller to use on the next call.
-// This is the same function used by both the 9P BlockOnce handler and
-// the internal consumer goroutine.
-func (ag *Agent) FeedBlockingRead(ctx context.Context, base string) ([]byte, string, error) {
-	_, ok := ag.WaitChange(ctx, WatchFeed, base)
-	if !ok {
-		return nil, base, ctx.Err()
-	}
-	data := ag.feed.Get()
-	hash := ag.feed.Hash()
-	return data, hash, nil
-}
+// FeedGet returns the current feed data.
+func (ag *Agent) FeedGet() []byte { return ag.feed.Get() }
+
+// FeedHash returns the current feed content hash.
+func (ag *Agent) FeedHash() string { return ag.feed.Hash() }
 
 // StartFeedConsumer spawns a goroutine that blocks on feed changes and
 // submits new data as prompts. Exits when ctx is cancelled.
@@ -700,14 +692,15 @@ func (ag *Agent) StartFeedConsumer(ctx context.Context) {
 	go func() {
 		var base string
 		for {
-			data, nextBase, err := ag.FeedBlockingRead(ctx, base)
-			if err != nil {
+			_, ok := ag.WaitChange(ctx, WatchFeed, base)
+			if !ok {
 				return
 			}
+			data := ag.feed.Get()
+			base = ag.feed.Hash()
 			if len(data) == 0 {
 				continue
 			}
-			base = nextBase
 			ag.Submit(ctx, string(data))
 			ag.EnsureTrailingNewline()
 		}

cmd/olliesrv/internal/fs/spec.go

@@ -397,24 +397,22 @@ func buildAgentChildren(a *agent.Agent, s *session.Session) []virtfs.FsNodeDecl
 				if len(data) == 0 {
 					return nil
 				}
-				// Skip NUL-only input.
-				allNul := true
 				for _, b := range data {
 					if b != 0 {
-						allNul = false
-						break
+						a.FeedWrite(data)
+						return nil
 					}
 				}
-				if allNul {
-					return nil
-				}
-				a.FeedWrite(data)
 				return nil
 			}),
 			virtfs.BlockOnce(func(cctx context.Context, base string) ([]byte, string, error) {
 				merged, cancel := mergeCtx(s.Ctx, cctx)
 				defer cancel()
-				return a.FeedBlockingRead(merged, base)
+				_, ok := a.WaitChange(merged, agent.WatchFeed, base)
+				if !ok {
+					return nil, base, merged.Err()
+				}
+				return a.FeedGet(), a.FeedHash(), nil
 			}),
 		),
 		virtfs.FileNode("chat", 0444,