feat(missions): publish the mission branch, gated by commit_policy

Completes delivery. A phase's work is now captured, committed, gated and
pushed — in that order, so every failure costs strictly less than the one
before it.

Publishing is last for a reason. By the time it runs the patch is on disk, the
artifact is registered and the work is on a local branch, so a rejected ref, a
rotated token or an unreachable forge costs a push and nothing else. A test
pushes at a path that does not exist and asserts the commit is still there
afterwards.

The gate decides the branch name, never whether the work survives:

- green, or policy `always`  → `clawmates/mission-<m8>-<p8>`
- red / unrunnable / no suite → `…-wip`
- `on_reviewer_approval`      → `…-review`

Both land on the forge. A human can inspect, fix and re-push a branch; nobody
can recover work discarded for failing a test. Deleting a red branch
reproduces the old behaviour on purpose rather than by accident.

`verify_tests` runs the project's own suite through the runtime container and
returns `Option<bool>` — `None` for "could not establish", which the gate
treats as unproven. An unreadable exit status is not a pass. That is the same
fail-closed stance as the phase evaluator, and it is here because this tranche
has now found four separate things reporting success while doing nothing.

Never force-push. A rejected update is reported and left alone: the remote ref
belongs to whoever set it, and overwriting it to make delivery look tidy is
how a mission eats someone else's commit.

The push URL is built fresh from the repo row and the ambient token, not read
from `.git/config` — which no longer carries credentials, since agents run as
root in a container that mounts the checkout.

Tests push to a real `git init --bare` remote and assert the ref and its
content actually arrived. A mock would have accepted anything.

Co-Authored-By: Claude Opus 5 <[email protected]>

crates/cm-api/tests/mission_delivery.rs

@@ -26,6 +26,7 @@ async fn capture(
         &root.join(mission.to_string()).join("repo"),
         &root.join("_outputs").join(mission.to_string()),
         0,
+        mission_delivery::Gate::Always,
     )
     .await
 }
@@ -426,3 +427,161 @@ fn a_rerun_lands_on_its_own_branch() {
         "pass 2 is named for the pass, not the index: {second}"
     );
 }
+
+/// Push against a real bare repository.
+///
+/// A mock remote would accept whatever we sent and prove nothing; the failures
+/// worth catching here — a rejected ref, a branch that never arrives, work
+/// pushed to the wrong name — are all things only a real git remote reports.
+#[tokio::test]
+async fn a_gated_push_reaches_the_remote() {
+    let tmp = tempfile::tempdir().unwrap();
+    let remote = tmp.path().join("remote.git");
+    std::fs::create_dir_all(&remote).unwrap();
+    Command::new("git")
+        .args(["init", "--bare", "--quiet"])
+        .arg(&remote)
+        .output()
+        .unwrap();
+
+    let mission = Uuid::now_v7();
+    let repo = seed_repo(tmp.path(), mission);
+    std::fs::write(repo.join("work.rs"), "fn shipped() {}\n").unwrap();
+    git(&repo, &["add", "."]);
+    git(&repo, &["commit", "--quiet", "-m", "work"]);
+    git(
+        &repo,
+        &["checkout", "-B", "clawmates/mission-test-aaaaaaaa"],
+    );
+
+    let out = mission_delivery::publish_phase_branch(
+        &repo,
+        remote.to_str().unwrap(),
+        "clawmates/mission-test-aaaaaaaa",
+        mission_delivery::Gate::Always,
+        None,
+    )
+    .await
+    .unwrap();
+    assert!(out.pushed, "push failed: {:?}", out.error);
+    assert_eq!(out.branch, "clawmates/mission-test-aaaaaaaa");
+
+    // The remote genuinely has it, with the content.
+    let refs = Command::new("git")
+        .arg("-C")
+        .arg(&remote)
+        .args(["for-each-ref", "--format=%(refname:short)"])
+        .output()
+        .unwrap();
+    let refs = String::from_utf8_lossy(&refs.stdout);
+    assert!(
+        refs.contains("clawmates/mission-test-aaaaaaaa"),
+        "refs: {refs}"
+    );
+
+    let show = Command::new("git")
+        .arg("-C")
+        .arg(&remote)
+        .args(["show", "clawmates/mission-test-aaaaaaaa:work.rs"])
+        .output()
+        .unwrap();
+    assert!(String::from_utf8_lossy(&show.stdout).contains("fn shipped()"));
+}
+
+/// A red suite must not block delivery — it must redirect it. The work still
+/// reaches the forge, on a branch whose name says it is unproven.
+#[tokio::test]
+async fn a_failed_gate_publishes_to_a_wip_branch() {
+    let tmp = tempfile::tempdir().unwrap();
+    let remote = tmp.path().join("remote.git");
+    std::fs::create_dir_all(&remote).unwrap();
+    Command::new("git")
+        .args(["init", "--bare", "--quiet"])
+        .arg(&remote)
+        .output()
+        .unwrap();
+
+    let mission = Uuid::now_v7();
+    let repo = seed_repo(tmp.path(), mission);
+    std::fs::write(repo.join("half_done.rs"), "fn broken() {}\n").unwrap();
+    git(&repo, &["add", "."]);
+    git(&repo, &["commit", "--quiet", "-m", "wip"]);
+    git(
+        &repo,
+        &["checkout", "-B", "clawmates/mission-test-bbbbbbbb"],
+    );
+
+    let out = mission_delivery::publish_phase_branch(
+        &repo,
+        remote.to_str().unwrap(),
+        "clawmates/mission-test-bbbbbbbb",
+        mission_delivery::Gate::OnGreenTests,
+        Some(false),
+    )
+    .await
+    .unwrap();
+
+    assert!(out.pushed, "a failed gate still publishes: {:?}", out.error);
+    assert!(
+        out.branch.ends_with("-wip"),
+        "verdict is in the name: {}",
+        out.branch
+    );
+
+    let refs = Command::new("git")
+        .arg("-C")
+        .arg(&remote)
+        .args(["for-each-ref", "--format=%(refname:short)"])
+        .output()
+        .unwrap();
+    let refs = String::from_utf8_lossy(&refs.stdout);
+    assert!(
+        refs.contains("-wip"),
+        "the work reached the forge anyway: {refs}"
+    );
+    assert!(
+        !refs.contains("clawmates/mission-test-bbbbbbbb\n"),
+        "and did not claim the clean branch name"
+    );
+}
+
+/// An unreachable remote is a degraded success, not a failure: the patch and
+/// the local branch both still exist.
+#[tokio::test]
+async fn an_unreachable_remote_does_not_lose_the_work() {
+    let tmp = tempfile::tempdir().unwrap();
+    let mission = Uuid::now_v7();
+    let repo = seed_repo(tmp.path(), mission);
+    std::fs::write(repo.join("work.rs"), "fn kept() {}\n").unwrap();
+    git(&repo, &["add", "."]);
+    git(&repo, &["commit", "--quiet", "-m", "work"]);
+    git(
+        &repo,
+        &["checkout", "-B", "clawmates/mission-test-cccccccc"],
+    );
+
+    let out = mission_delivery::publish_phase_branch(
+        &repo,
+        &tmp.path().join("does-not-exist.git").display().to_string(),
+        "clawmates/mission-test-cccccccc",
+        mission_delivery::Gate::Always,
+        None,
+    )
+    .await
+    .unwrap();
+
+    assert!(!out.pushed);
+    assert!(
+        out.error.is_some(),
+        "the reason is recorded for the operator"
+    );
+
+    // The commit is still there locally — nothing was rolled back.
+    let show = Command::new("git")
+        .arg("-C")
+        .arg(&repo)
+        .args(["show", "HEAD:work.rs"])
+        .output()
+        .unwrap();
+    assert!(String::from_utf8_lossy(&show.stdout).contains("fn kept()"));
+}