chore(deps): Bump marked from 15.0.12 to 18.0.4 (#155)

* chore(deps): Bump marked from 15.0.12 to 18.0.4

Bumps [marked](https://github.com/markedjs/marked) from 15.0.12 to 18.0.4.
- [Release notes](https://github.com/markedjs/marked/releases)
- [Commits](markedjs/marked@v15.0.12...v18.0.4)

---
updated-dependencies:
- dependency-name: marked
  dependency-version: 18.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix(deps): override marked-terminal peer to accept marked 18

marked-terminal@7.3.0 declares peer marked '>=1 <16' and has no release
supporting marked 16+, so the bare bump made `npm install` fail ERESOLVE
(CI runs `just setup` -> `npm install`). Add an npm `overrides` entry
pinning marked-terminal's marked to the root `$marked` (18). The terminal
renderer is the sole `marked` consumer (src/agent/markdown-renderer.ts)
and its 12 regression tests + the full suite pass under marked 18.

Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Simon Davies <simongdavies@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -37,7 +37,7 @@
     "boxen": "^8.0.1",
     "highlight.js": "^11.11.1",
     "hyperlight-analysis": "file:src/code-validator/guest",
-    "marked": "^15.0.12",
+    "marked": "^18.0.4",
     "marked-terminal": "^7.3.0",
     "zod": "^4.3.6"
   },
@@ -55,5 +55,10 @@
     "tsx": "^4.0.0",
     "typescript": "^5.8.0",
     "vitest": "^4.0.18"
+  },
+  "overrides": {
+    "marked-terminal": {
+      "marked": "$marked"
+    }
   }
 }