chore(deps)(deps): bump jsonschema from 4.25.1 to 4.26.0

Bumps [jsonschema](https://github.com/python-jsonschema/jsonschema) from 4.25.1 to 4.26.0.
- [Release notes](https://github.com/python-jsonschema/jsonschema/releases)
- [Changelog](https://github.com/python-jsonschema/jsonschema/blob/main/CHANGELOG.rst)
- [Commits](python-jsonschema/jsonschema@v4.25.1...v4.26.0)

---
updated-dependencies:
- dependency-name: jsonschema
  dependency-version: 4.26.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -12,7 +12,7 @@ beautifulsoup4>=4.12.0
 pdfplumber>=0.10.0
 
 # JSON Schema validation (pinned for Agent 1 core setup)
-jsonschema==4.25.1
+jsonschema==4.26.0
 
 # Linting (for development and CI)
 ruff>=0.1.0