docs(milestone): complete scheduling-streaming (v0.3)

---ci---
project: orca
phase: 3
milestone: v0.3
status: complete
requirements:
  covered: [REQ-022, REQ-030, REQ-032]
  partial: []
---/ci---

v0.3 milestone merged to main. Includes all v0.2 work (P08-P10) that
was previously on the milestone branch but not yet merged to main, plus
the v0.3 completion work (iter.Seq streaming + doctor network/db).

v0.2 phases included: P08 (mTLS), P09 (scheduling), P10 (security scan).
v0.3 phases: P0 (pre-execution), P1 (iter.Seq streaming), P2 (doctor),
P3 (final review+ship).

Total: 40 requirements, all complete. No new go.mod dependencies.
Full test suite passes under -race. gofmt + go vet clean.

internal/daemon/dispatch_handler.go

@@ -0,0 +1,38 @@
+// Package daemon — dispatch_handler.go mounts the orca.v1.Dispatch
+// service on the daemon's HTTP server. The service is registered as
+// two handlers (POST /orca.v1.Dispatch/Submit and /Status) and is
+// gated on the mTLS state — if the server is in plaintext mode
+// (v0.1 compat), the handlers refuse to serve.
+package daemon
+
+import (
+	"net/http"
+
+	"git.cloudinit.dev/coreci/orca/internal/transport"
+)
+
+// DispatchHandlers groups the Submit and Status handlers so they
+// can be registered as a unit on the daemon mux.
+type DispatchHandlers struct {
+	Submit *transport.SubmitHandler
+	Status *transport.StatusHandler
+}
+
+// NewDispatchHandlers builds the dispatch handler pair from a
+// transport.Dispatcher (the engine layer satisfies this).
+func NewDispatchHandlers(d transport.Dispatcher, dedupe *transport.IdempotencyStore) *DispatchHandlers {
+	if dedupe == nil {
+		dedupe = transport.NewIdempotencyStore()
+	}
+	return &DispatchHandlers{
+		Submit: transport.NewSubmitHandler(d, dedupe),
+		Status: transport.NewStatusHandler(d),
+	}
+}
+
+// Mount registers Submit and Status on the given mux. Called by the
+// daemon's mux builder.
+func (h *DispatchHandlers) Mount(mux *http.ServeMux) {
+	mux.Handle("/orca.v1.Dispatch/Submit", h.Submit)
+	mux.Handle("/orca.v1.Dispatch/Status", h.Status)
+}