CI-004: v button — run the project's default build+test as a bg job

Now
OPEN
See
CI-001
See
TODO-006

Local one-keystroke CI: the pager's v button detects the project's conventional build+test entry point ("default stuff": ./ci.sh, ./scripts/ci.sh, cmake+ninja+ctest, ./configure && make && make test, and the per-language equivalents), runs it as a detached background job in the worktree, and puts the verdict into the per-repo cache. Separate from the qemu runner fleet (CI-001/CI-003) — this is the local leg; the fleet can later reuse the same detector script inside its VMs.

Input

Context

Goals

Constraints

WIP

Design decisions

TODOs

Blockers and bummers

Outcome

r2, the ci VIEW (supersedes r1's reserved-word wiring):