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Add agentic workflow to build latest F* master against latest Z3 master (#9733)

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This introduces an agentic workflow that continuously validates Z3→F*
integration by building Z3 from this repository’s `master` and then
building `FStarLang/FStar` from its latest `master` using that exact Z3
binary.

- **Workflow added**
  - New source workflow: `.github/workflows/fstar-master-build.md`
- New compiled workflow: `.github/workflows/fstar-master-build.lock.yml`
  - Triggered on `daily` schedule and `workflow_dispatch`.

- **Build orchestration**
- Checks out Z3 `master` and builds/installs it with CMake + Ninja into
`/tmp/gh-aw/agent/z3-install`.
- Clones latest `FStarLang/FStar` `master` and records the exact commit
SHA used.
  - Forces F* build to use the locally built Z3 via:
    - `PATH=/tmp/gh-aw/agent/z3-install/bin:$PATH`
    - `Z3_EXE=/tmp/gh-aw/agent/z3-install/bin/z3`

- **Reporting + failure handling**
- On success: posts a discussion with Z3 commit/version, F* commit, and
command summary.
- On failure: opens an issue with failing phase, error summary, and log
excerpts.
- Uses safe-outputs with bounded lifetime (`expires: 14d`) and explicit
failure labeling.

```yaml
safe-outputs:
  create-discussion:
    title-prefix: "[F* Build] "
    close-older-discussions: true
    expires: 14d
  create-issue:
    title-prefix: "[F* Build Failure] "
    labels: ["build", "fstar"]
```

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
This commit is contained in:
Copilot 2026-06-05 14:45:00 -07:00 • committed by GitHub
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