Fix orphan-files: vally doesn't URL-decode link targets

Root cause found by installing @microsoft/vally-cli locally and reading its
source: extractFileReferences' regex handles literal brackets in a link URL
fine (it only excludes parens/whitespace), but orphan-files.js resolves
ref.normalized directly against the filesystem with no decodeURIComponent
step — so my earlier percent-encoded route.ts link (%5B%5D) never matched
the real path. Fixed by using the raw literal path (brackets and all) with
a bracket-free link label instead. Verified locally: vally lint now reports
3/3 checks passed, orphan-files 18/18 reachable.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lordlinus

skills/foundry-hosted-agent-copilotkit/references/snippets/README.md

@@ -31,7 +31,7 @@ adaptation — just don't start there.
 | [`hosted/responses/main.py`](hosted/responses/main.py) | `hosted/responses/main.py` | Entry point wrapping `build_hosted_agent()` in `ResponsesHostServer`. Prefer generating this (and `agent.yaml`/`azure.yaml`/`Dockerfile`/`infra/`) with `azd ai agent init` instead — this file is here mainly to show the import shape. |
 | [`backend/bridge_app.py`](backend/bridge_app.py) | `backend/bridge_app.py` | The ENTIRE bridge in one file: FastAPI AG-UI endpoint, the streaming Responses HTTP client (DIRECT local / platform deployed), the Responses→AG-UI translation, HITL forwarding, and an SSE keep-alive. |
 | [`backend/requirements.txt`](backend/requirements.txt) | `backend/requirements.txt` | Bridge-only deps (no agent-framework/foundry packages — the bridge runs no model). |
-| [`frontend/app/api/copilotkit/[[...slug]]/route.ts`](<frontend/app/api/copilotkit/[[...slug]]/route.ts>) | same path | CopilotKit runtime handler pointed at the bridge. |
+| [CopilotKit catch-all route (`route.ts`)](frontend/app/api/copilotkit/[[...slug]]/route.ts) | `frontend/app/api/copilotkit/[[...slug]]/route.ts` | CopilotKit runtime handler pointed at the bridge. |
 | [`frontend/app/providers.tsx`](frontend/app/providers.tsx) | `frontend/app/providers.tsx` | `<CopilotKit>` provider + HITL/tool-card component registration. |
 | [`frontend/components/ApprovalHitl.tsx`](frontend/components/ApprovalHitl.tsx) | `frontend/components/` | `useHumanInTheLoop` example for the gated tool. |
 | [`frontend/components/ToolCards.tsx`](frontend/components/ToolCards.tsx) | `frontend/components/` | `useRenderTool` examples for both tools. |