chore: add default CODEOWNERS for auto-reviewer assignment

[LukasWodka]

Summary

Adds a default * rule to .github/CODEOWNERS so every PR in this repo auto-requests at least one reviewer (squad lead). Closes the gap where many PRs were landing in "In review" with no Reviewer field set.

Why

Currently the kanban shows a lot of cards in In review without a Reviewer assigned — theres no automatic mechanism to pick one. Adding a default CODEOWNERS line makes GitHub auto-request the squad lead for every PR. Either of the two listed owners can approve (branch protection requires 1 review).

What changes

• New default rule at the top of .github/CODEOWNERS (or new file if none existed)
• Existing narrow security rules (where present) are preserved unchanged below — they still trigger Asad as additional required co-reviewer for security-sensitive paths

Behavior

PR scenario	Auto-requested reviewer
Regular PR	The two squad-lead defaults
PR touching a file in # === Narrow security CODEOWNERS === (where present)	The squad-lead defaults + Asad
PR opened by one of the squad leads	The other squad lead (GitHub skips the author)

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