docs(ravion): document --description on project config apply

[devin-ai-integration]

Summary

Documents the new ravion project config apply --description flag (flightcontrolhq/flightcontrol#6743), which sets the description on every stack run an apply creates so runs link back to the change that caused them.

The CI-integration workflow template's apply job now derives the link and passes it, preferring the PR referenced by the merge/squash commit subject and falling back to the commit:

description="Config apply from $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/commit/$GITHUB_SHA"
pull_request=$(head -n 1 <<< "$COMMIT_SUBJECT" | grep -oE '#[0-9]+' | tail -n 1 | tr -d '#') || true
[ -n "$pull_request" ] && description="Config apply from $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/pull/$pull_request"

RAVION_CLI_VERSION in the template and its agent-prompt step move to 0.2.20, the first release with the flag. cli/reference/project.mdx is regenerated from the CLI, and config-as-code/project-config-file.mdx mentions the flag alongside --autoapprove.

Link to Devin session: https://app.devin.ai/sessions/1394b1c0836f44fc8ef4ac685d431726
Requested by: @flybayer

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