Apply Validated Workflow Fixes from Sandbox Testing

[Gvieve]

Applies all production workflow fixes validated through sandbox testing (Phase 8A), plus documentation updates.

Workflow Fixes

openapi-generate-and-push.yml

• Fixed version bump not applying — $VERSION was incorrectly quoted when passed to version.rb
• Fixed generated files nesting in subdirectories — added rm -rf before mv in Process-and-Push
• Added config file artifact upload/download between Generate and Process-and-Push jobs (separate runners were losing version bump changes)
• Added cleanup of config artifact directories to prevent them from being committed
• Removed temporary workflow_dispatch trigger (production uses repository_dispatch only)
• Added GitHub App token generation + repository_dispatch to trigger on-push-master.yml after push (GITHUB_TOKEN pushes don't trigger other workflows)
• Added Slack failure notification on Process-and-Push

on-push-master.yml

• Fixed skip-publish check breaking on commit messages containing double quotes — uses env: block instead of inline ${{ }} interpolation
• Added repository_dispatch trigger (automated_push_to_master) for automated flow
• Updated dorny/paths-filter to use base: HEAD~1 for repository_dispatch events
• Added Slack failure notification for orchestration jobs

generate.yml, publish.yml, release.yml

• Updated Slack message_format — workflow name now links directly to the failed run URL
• Removed redundant footer

Documentation

• Updated all docs/ files to reflect finalized workflow behavior (triggers, artifact pipeline, skip-publish fix, troubleshooting entries)