chore: merge origin/dev into v2

Brings the latest dev (45 commits) into v2. Conflict resolutions:

- core/src/session.ts: keep v2's Service (BusyError active-checks in
  revert.stage/clear/commit, rename method + Renamed event) and add
  dev's history method. v2's Renamed event flows through the merged
  SessionEvent.Definitions into the OpenCodeEvent union, so it encodes
  correctly on the SSE stream.
- server/src/handlers/event.ts: take dev's OpenCodeEvent encoder, which
  supersedes v2's PublicEventManifest handler wiring. This also brings
  dev's live event stream (allBounded + heartbeat + keepalive headers)
  onto v2.
- Removed the now-orphaned public-event-manifest.ts (only self-referenced
  after taking dev's handler).
- Generated client + sdk types regenerated via codegen (not hand-merged);
  they pick up dev's effect SSE OpenAPI-naming patch (V2EventStream).

packages/session-ui/src/components/markdown-inline-code-kind.ts

@@ -1,6 +1,7 @@
 export function inlineCodeKind(text: string): "path" | "url" | undefined {
   if (/^https?:\/\//i.test(text)) return "url"
   if (/^[a-z][a-z0-9+.-]*:\/\//i.test(text)) return
+  if (text === "/") return
   if (/^\/[a-z][a-z0-9-]*$/i.test(text)) return
   if (/\s/.test(text)) return
   if (/[()\[\]{}*+=<>|&^"';]/.test(text)) return

packages/session-ui/src/components/markdown.css

@@ -49,12 +49,20 @@
     line-height: var(--line-height-large);
   }
 
-  h3,
+  h3 {
+    font-size: 13px;
+    color: var(--v2-text-text-base);
+    font-weight: var(--font-weight-medium);
+    margin-top: 0px;
+    margin-bottom: 24px;
+    line-height: var(--line-height-large);
+  }
+
   h4,
   h5,
   h6 {
     font-size: 13px;
-    color: var(--v2-text-text-base);
+    color: var(--v2-text-text-muted);
     font-weight: var(--font-weight-medium);
     margin-top: 0px;
     margin-bottom: 24px;