feat: Add native DNSBL and GitSync implementations#83

Draft

MrLenin wants to merge 10 commits intoevilnet:masterfrom

MrLenin:feature/native-dnsbl-gitsync

Commits on Jan 1, 2026

fix: Add missing +1 to ircd_strncpy size parameters

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feat: Implement native DNSBL and Linesync support

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refactor: Replace linesync (curl) with gitsync (libgit2)

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feat: Complete gitsync implementation with TLS cert tag support

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feat: Add gitsync security hardening and remote command support

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feat: Add native GitSync with libgit2 and SSH key auto-generation

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fix: DNSBL security vulnerabilities and whitelist exemption

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security: Fix command injection and TOCTOU vulnerabilities in GitSync

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fix: Clear DNSBL server list on rehash to prevent duplicates

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Commits on Jan 2, 2026

Merge upstream/master: security hardening fixes
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