chore(main): release 0.5.1

[github-actions]

🤖 I have created a release beep boop

0.5.1 (2026-07-10)

Bug Fixes

• bounties: add tests for claim_bounty repo-read gate (#160) (#169) (6bafaa6)
• deps: bump crossbeam-epoch to 0.9.20 for RUSTSEC-2026-0204 (#162) (#163) (67ad2b8)
• node,git: bound a hung served git with a total-duration timeout (#62) (#165) (cd67718)
• node: bound list_ref_certificates with LIMIT and add upsert to prevent unbounded growth (#147) (#149) (6b5e5bc)
• node: gate POST /api/v1/sync/trigger and rate-limit the peer-sync routes (#82) (#161) (d00d89a)
• node: rate-limit repo/agent creation per client IP to stop DID-farm spam floods (#180) (dfcaa22)
• release: build aarch64-musl natively on arm64 runners, replace retired macos-13 (#155) (6cff528)
• visibility: gate repo-scoped read surfaces on visibility (#120) (#157) (26bc3f6)

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[github-actions]

🤖 Created releases:

• v0.5.1

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