Integrate the brownfield /gsd:onboard skill into the skill subsystems so the
full CI suite passes:
- Route onboard under commands/gsd/ns-project.md (requires + routing row) so it
nests as gsd-ns-project/skills/onboard on nested-layout runtimes instead of
leaking as a 7th top-level skill dir (fixes install-nested-layout + issue-69).
- Remove onboard from PROFILES.core (src/install-profiles.cts) so the frozen
main-loop core stays at 8 skills; onboard remains in standard/full.
- Add the TEXT_MODE plain-text fallback note to gsd-core/workflows/onboard.md
for non-Claude runtimes (#2012).
- Allowlist onboard.md as a user-invocable skill (enh-2790 ratchet).
- Regenerate docs/INVENTORY-MANIFEST.json, golden-install-parity fixtures, and
the workflow size baseline to match.
Co-authored-by: Codesmith <codesmith-bot@users.noreply.github.com>
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