Increment 1 - Step 8: Public Repository Readiness

[angelobarbu]

Step 8: Public-repo readiness

Final step of Increment 1: everything the repository needs to go public and stay trustworthy — a license, continuous integration, and the README touches that go with them.

What's new

• LICENSE — MIT.
• GitHub Actions CI (.github/workflows/ci.yml) — on every push to main / increment-* and on pull requests, a macOS (Apple Silicon) runner installs the Homebrew dependencies, configures with the new ci preset, builds with -Werror, checks formatting, and runs the unit and UI test suites. Superseded runs are cancelled automatically.
• ci presets — identical to dev except for the machine-specific AGL SDK pin, which the runner's Xcode 16 SDK doesn't need.
• README — CI and license badges, a Continuous-integration paragraph in the workflow section, the ci preset in the presets table, a License section, and log row 1.8.

Notes

• Integration tests are opt-in (MODULO_TEST_DB_URL) and report as Skipped in CI — macOS runners can't provide PostgreSQL via Docker. A Linux job with a Postgres service container will come with the containerized backend.
• CI uses the lightweight clang-format formula rather than the full llvm keg; if its version ever formats differently from the local toolchain, the fix is a one-line switch in the workflow.