ARM64 + Apple Silicon Support for Polar Agents

[vonjackets]

This is an epic that tracks the work required to ensure all Polar services and agents—including the Cassini broker—build and run correctly on ARM64 systems, including Apple Silicon (M1/M2/M3). The goal is to enable developers using these platforms to contribute to and run the Polar framework locally and in containerized environments.

Acceptance Criteria:

• All Polar agents (e.g., Jira observer, Neo4j processor, Cassini broker) successfully build and run on ARM64 targets.
• Nix flake builds complete successfully on native ARM64 systems.
• Images for Polar agents can be built and run on ARM64 (native or via emulation).
• CI/CD is updated to test builds for x86_64 and aarch64.
• Documentation notes any ARM-specific caveats or workarounds (e.g., emulation, Rosetta, flake overrides).

Notes:

• Nix on M1/M2 is functional but not without landmines. Emulation is a fallback but should not be the default.
• Cross-compilation may be required for some dependencies that lack native ARM builds.
• Prefer native builds over emulated ones, but don't block progress if emulation is required temporarily.

[vonjackets]

Looks like support is batteries included with nix, we can specify system flags and it takes care of the rest, provided it can find packages for the platform. Closing