Files
Alexander Watson 1d7909cb38 chore: add open-source compliance files and SPDX headers (#71)
Add Apache 2.0 licensing, SPDX copyright headers on all source files,
DCO enforcement, third-party notices, and CI enforcement.

- LICENSE: Apache License 2.0 full text
- DCO: Developer Certificate of Origin 1.1
- SPDX headers on all 176 source files (.rs, .py, .proto, .rego, .sh,
  .toml, .yaml, Dockerfiles)
- scripts/update_license_headers.py: header management with --check mode
- scripts/generate_third_party_notices.py: dependency license aggregation
- THIRD-PARTY-NOTICES: generated listing of all Rust and Python deps
- build/license.toml: mise tasks for license:check and license:update
- CI: license-headers job in checks.yml, DCO check workflow
- CONTRIBUTING.md: DCO sign-off requirement and license header docs
- Cargo.toml: license changed to Apache-2.0, repository URL updated
- pyproject.toml: license field added

Closes #58
2026-03-03 09:30:56 -08:00
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