feat(forge): pluggable forge abstraction + GitLab and Gitea/Forgejo/Codeberg (#1913)

* refactor(forge): forge-neutral foundation (GitHub-only)

Decouple git-hosting from GitHub behind a neutral abstraction (issue #1616), GitHub-only for now; existing GitHub behaviour is unchanged.

- Forge manifest, neutral ForgeService contract, forge registry + resolver, and a client forge-module registry.
- GitHub code renamed to the neutral shape; PR/Issue attachment wording preserved.
- forge.search.response enums parse tolerantly (unknown kind/auth state degrade instead of breaking the client).
- createPullRequest reports typed CLI/auth errors instead of a generic message.
- forge-resolver host/remote caches are LRU-bounded.
- Forge host trust is explicit: only a known cloud host or a CLI-authenticated host is ever talked to; an unauthenticated GitHub Enterprise host fails resolution instead of routing to github.com.
- Docs: forge-providers guide, glossary and i18n forge-copy conventions, architecture and rpc-namespacing terminology.
- Vitest React Native mocks (unistyles, svg, linking, lucide) consolidated into shared aliased test-stubs.

* feat(forge): GitLab adapter, forge-aware UI, pipelines and approvals

GitLab adapter over the glab CLI on the neutral contracts: MR status, forge-aware UI, pipeline tree, and N-of-M approvals.

- threadIsResolved is part of the neutral timeline item.
- Pipeline load failures show an error instead of an empty section.
- Manual pipeline jobs render as pending.
- Fork/detached MR head pipelines are fetched by MR iid (glab ci get --merge-request).

* feat(forge): Gitea family adapter (Gitea, Forgejo, Codeberg)

One adapter over the tea CLI serving Gitea, Forgejo, and Codeberg on the neutral contracts.

- CI status aggregates commit statuses and Actions runs together.
- Gitea's terminal "warning" state maps to failure on server and client.
- Gitea Actions check details are reachable from the PR pane by workflowRunId.

* refactor(forge): localize compatibility handling

* test(forge): expect normalized GitLab facts

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/components/workspace-setup-dialog.tsx

@@ -18,7 +18,10 @@ import { normalizeAgentSnapshot } from "@/utils/agent-snapshots";
 import { applyLegacyDaemonWorkspaceOwnership } from "@/workspace/legacy-daemon-workspaces";
 import { encodeImages } from "@/utils/encode-images";
 import { toErrorMessage } from "@/utils/error-messages";
-import { splitComposerAttachmentsForSubmit } from "@/composer/attachments/submit";
+import {
+  resolveComposerAttachmentSubmitFormat,
+  splitComposerAttachmentsForSubmit,
+} from "@/composer/attachments/submit";
 import type {
   CreateAgentRequestOptions,
   DaemonClient,
@@ -171,6 +174,9 @@ export function WorkspaceSetupDialog() {
   const [pendingAction, setPendingAction] = useState<"chat" | null>(null);
 
   const serverId = pendingWorkspaceSetup?.serverId ?? "";
+  const supportsForgeSearch = useSessionStore(
+    (state) => state.sessions[serverId]?.serverInfo?.features?.forgeSearch === true,
+  );
   const sourceDirectory = pendingWorkspaceSetup?.sourceDirectory ?? "";
   const displayName = pendingWorkspaceSetup?.displayName?.trim() ?? "";
   const workspace = createdWorkspace;
@@ -309,7 +315,11 @@ export function WorkspaceSetupDialog() {
           throw new Error(t("workspaceSetup.errors.selectModel"));
         }
 
-        const wirePayload = splitComposerAttachmentsForSubmit(attachments);
+        const wirePayload = splitComposerAttachmentsForSubmit(attachments, {
+          format: resolveComposerAttachmentSubmitFormat({
+            supportsForgeAttachments: supportsForgeSearch,
+          }),
+        });
         const encodedImages = await encodeImages(wirePayload.images);
         const workspaceDirectory = requireWorkspaceDirectory({
           workspaceId: ensuredWorkspace.id,
@@ -363,6 +373,7 @@ export function WorkspaceSetupDialog() {
       t,
       toast,
       withConnectedClient,
+      supportsForgeSearch,
     ],
   );