docs(spec): hold helper instances as not-ready behind Emacs surface and test gating

Two gaps block implementation. Sessions are also born from Emacs terminal buffers, where roster detection works (the scan matches process cwd, and eat/vterm shells are children of emacs) but the deterministic spawn path doesn't exist; the open issue weighs an elisp command against shelling out to ai with a no-tmux mode, leaning to the latter so the logic lives once.

Second, template sync makes "live everywhere" the default failure mode for startup.org changes, so the test strategy gains three-ring gating: bats with sleeper processes and a byte-identical no-op guarantee, a disposable sandbox project for the corruption, orphaned-helper, and raw-launch drills, then a dormant-by-construction pilot through project-scripts before the template-wide release. The Status section carries the readiness checklist and the implementation task is blocked on it.

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