chore: upgrade gh-aw to v0.82.13 (pre-release) and recompile workflows (#6399)

- Upgraded gh-aw extension to latest pre-release v0.82.13
- Recompiled all agentic workflow lock files
- Applied post-processing to smoke/build-test workflows
- Removed legacy env_key from openai-proxy provider in codex config

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: lpcox