dev-0.26.0-rc.1

feat(az): add Azure CLI provider with compact command filters

Rebased onto develop branch per PR #341 feedback. Adds `rtk az` command
with token-optimized output for Azure DevOps pipelines, monitor, webapp,
account, and other az subcommands. Includes discovery rules, registry
classification/rewrite tests, and init examples.

Resolves PR #341 feedback:
- Retargeted to develop branch (cherry-picked onto develop base)
- Fixed rewrite_command call signatures for current codebase

https://claude.ai/code/session_017A5C9PNYXiAo2gu4N9md42