1.18.0

🚀 Enhancements

• Adds exponential backoff + jitter retries to OCI artifact fetches via a new BackoffPolicy (configurable under self_update.download_retry), replacing the old with_retries(usize, Duration) API.
• add post-download script support for OCI packages.
• Hardens service restart policies on Linux and Windows (systemd rate limiting: 5 restarts max in 60s) to prevent crash-looping from saturating CPU.
• Added support for remote agent type definition retrieval from OCI registries.
• Agent type definitions now tolerate unknown fields for forward compatibility.
• On-host agents: now it is possible to avoid specifying a health check in the agent type definition, in which case the agent health will be not reported.
• On-host agents: removed command-based version checking. Agent version is now determined from OCI package metadata, eliminating the need for deployment.version configuration in agent type definitions.
• Replace filesystem in on-host agent-type definitions with an explicit, recursive, tagged-kind tree: every entry declares kind: file | dir | dir_content_from_map, and dir entries nest via entries:.
• On-host filesystem entries now accept a persistent flag (default false): ephemeral entries are deleted on sub-agent stop, persistent entries survive until the agent is removed from the fleet. Reconciliation across writes is driven by a .ac-managed-paths.json manifest (reserved filename — agent types must not declare it) so paths Agent Control no longer owns are deleted while sub-agent-created files are preserved.
• Include new 'shared-filesystem-dir` variable for Agent Types.
• Extend internal fs crate with a copy operation.
• Removing an agent from the fleet now also deletes its installed packages from disk.

🐞 Bug fixes

• On-host self-update: an empty version: "" pushed from Fleet Control now behaves the same as an absent version field (no-op, no update attempted). Previously it silently triggered a pull of the :latest OCI tag.

⛓️ Dependencies

• Updated rust crate config to 0.15.25
• Updated rust crate syn to 2.0.118
• Updated alpine/helm to v4.2.2
• Updated rust crate bytes to 1.12.0
• Updated rust crate serde-saphyr to 0.0.29
• Updated rust crate actix-web to 4.14.0
• Updated rust crate quote to 1.0.46
• Updated kubernetes crates (major)
• Updated rust crate opentelemetry-semantic-conventions to 0.32.1
• Updated rust crate mockall to 0.15.0
• Updated rust to v1.96.1
• Updated rust crate aws-lc-rs to 1.17.1
• Updated rust crate rustls-pki-types to 1.15.0
• Updated rust crate opamp-client to v0.0.41