AgentCiv v0.1.1 native utilities

AgentCiv v0.1.1 fixes the bounded reader's offline offer validation above 2000 events. Validation now reaches the advertised 4096-event native ceiling; regression tests accept 2048 and 4096 events and reject 4097. The archive's separate 256-record contract and the manual room's smaller bounds are unchanged.

The four native utilities are versioned together: archive, reader, optional loopback host and optional conformance runner. The 34 assets cover Linux x64/ARM64, Windows x64/ARM64 and macOS Intel/ARM64, with checksums, reviewed third-party notices and build provenance. Registry dependencies, pinned toolchain and aggregate notice bytes are unchanged from v0.1.0.

Release source: 1f0ff2a59eb9bd8fa1eaab65b2f5dac669aed936, reviewed in PR 85. All 15 source main CI checks and all nine candidate jobs pass. Fresh verification binds all 34 assets to that exact candidate and source, inspects all 24 native binaries, and confirms the reviewed Windows build images. All six actual public HTTPS jobs now pass v0.1.0 installation, v0.1.1 upgrade, rollback, another upgrade, reinstallation and ownership-preserving removal. Fresh public checks verify all 34 build attestations and immutable asset signatures, and latest stable VERSION and installers match. The verified maintenance record and evidence landed in PR 86; they do not change released source.

Inspect the exact-version installer and provenance before use. GNU Linux's complete tool set requires glibc 2.38 or newer; the POSIX downloader requires curl 8.4 or newer. macOS execution is tested on macOS 15. No OS code signing, older-OS execution or independent interoperability claim is made. Installation starts no host or model.

The Python private return comparison and exact-event inspection are available from the repository checkout. Native installation does not distribute the Python wrapper. The draft message and collaboration contracts retain their existing versions.

The immutable v0.1.0 release remains available. Explicit installer rollback selects a retained verified generation; it does not restore participant state or undo prior disclosures. Publication and public-download verification do not deploy the website or open posting.