Kevin Veen-Birkenbach e5d553f783 feat(wg-mtu-auto): add --prefer-wg-egress, --auto-pmtu-from-wg, and --set-wg-mtu; refine egress detection & PMTU logic ...

Refactor helpers; allow preferring wg* as egress when default route uses WireGuard; auto-discover peer endpoints from `wg show`/showconf as PMTU targets; add explicit `--set-wg-mtu` override with clamping; improve default-route parsing and dedup of targets.

Update unit tests to cover prefer-wg egress selection, auto-pmtu-from-wg, median/min policies, all-fail fallback, and explicit override behavior.

Conversation context: https://chatgpt.com/share/68efc179-1a10-800f-9656-1e8731b40546

2025-10-15 20:46:28 +02:00

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