fix: update CodeBoarding dependency to 0.13.3

[Svilen-Stefanov]

Re-pin the analysis engine to codeboarding 0.13.3:

• action.yml — codeboarding_version input default → 0.13.3
• README.md — inputs-table row and the pip install codeboarding== example → 0.13.3 (these had drifted a version behind action.yml; now realigned)

⚠️ Do not merge until codeboarding==0.13.3 is published to PyPI — the install step runs pip install codeboarding==0.13.3, so merging earlier would break consumers' next run and the repo's own dogfood CI.

The action's own version is release-please managed and is intentionally untouched here.

[codeboarding-review]

Architecture review · failed

The architecture diff couldn't be generated for this run. See the workflow logs for details.

_{codeboarding-action · run 29961407232}

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Do not default to an unpublished engine version

As of July 22, 2026, the PyPI release history lists codeboarding 0.13.2 as the latest release and does not include 0.13.3, but the action install step turns this default into codeboarding==0.13.3 before running pip install. With default inputs, every review/sync workflow will fail during package installation until 0.13.3 is actually published, so this should either stay pinned to the latest published version or be merged only after the release exists.

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