The --runtime parsing + help-text edit to gsd-core/bin/gsd-tools.cjs changes
the installed file's content (gsd-tools.cjs is installed and compared by the
golden snapshot, unlike gsd-core/bin/lib/ which is excluded). Regenerated via
UPDATE_GOLDEN=1; every runtime's manifest updates exactly one line (the
gsd-tools.cjs hash).
The legacy _isSkillsRuntime gate was a hardcoded isCodex || isCopilot || ...
roster; zcode was absent so the layout-driven skills-install path was skipped
(commands + agents installed, but no skills). Adding || isZcode would violate
AC#3 (no runtime === 'zcode' branches), so the gate is now derived from the
descriptor: a runtime takes the skills path iff its scoped artifactLayout
declares a skills kind. Behavior-preserving for all 15 existing runtimes
(verified by their install contracts); includes zcode (and any future skills
runtime) with zero per-runtime branches. opencode/kilo keep their specialized
combined path.
Regenerate the golden-install-parity fixtures: the non-zcode runtimes shift only
the shared model-catalog.json hash (zcode was added to the catalog); zcode now
includes its skills tree.
Resolve the zcode test cascade exposed by gsd-test:
- model-catalog.json: add zcode runtimeTierDefaults (null tiers, matching the
other profile-marker-only runtimes) so KNOWN_RUNTIMES stays parity with allRuntimes.
- runtime-name-policy: add zcode to GLOBAL_CONFIG_HOME_FRAGMENTS (~/.zcode) so
getGlobalConfigHomeFragment stops falling through to the .claude default.
- installer-migration-install: add the zcode fresh-install contract (flat-skills,
no settings, no package.json — same shape as trae).
- golden-install-parity: capture the zcode fixture via a standalone generator
script (not node --test — the gate stays gsd-test).
- capability-matrix.md: regenerate so zcode appears as a first-party row.
Fluidify the remaining count-pinned guards so adding a runtime no longer trips a
hand-pinned snapshot: gemini-runtime-removed (flag count derives from the
registry), non-claude-runtimes-registry-derivation (golden list derived from the
registry).
