ci: run CI and CodeQL on pull requests that do not target main

[josephfusco]

ci.yml and codeql.yml filter pull_request to branches: [ main ], so a pull request based on anything else runs neither. On the network presence stack that is #333 through #337: 4 checks each, against 17 on #332.

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5
Used for: Assisting with diagnosis and the fix

[github-actions]

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Props joefusco.

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