Adds `make coverage` (per-package + total via -coverpkg=./...),
`make coverage-html`, and `make coverage-total` (CI-friendly). Wires
coverage.out/coverage.html through `make clean` and .gitignore.
Closes the two easy zero-coverage packages: namegen (77.8%) and
sessionstream (93.5%). Total statement coverage 51.7% -> 52.1%.
Add daemon-backed workspace and guest-session primitives so host
orchestrators can prepare /root/repo, launch long-lived guest commands,
and attach to pipe-mode sessions over the local stdio mux bridge.
Persist richer session metadata and launch diagnostics, preflight guest
cwd/command requirements, make pipe-mode attach rehydratable from guest
state after daemon restart, and allow submodules when workspace prepare
runs in full_copy mode.
At the same time, stop vm run from auto-attaching opencode, make it
print next-step commands instead, and make glibc guest images more
agent-ready by installing node, opencode, claude, and pi while syncing
opencode/claude/pi auth files into work disks on VM start.
Validation:
- GOCACHE=/tmp/banger-gocache go test ./...
- make build
- banger vm workspace prepare --help
- banger vm session --help
- banger vm session start --help
- banger vm session attach --help
