Mechanical rename produced by scripts/msd-rename.cjs: gsd/Gsd/GSD -> msd/Msd/MSD
across contents and paths, upstream package/repo coordinates -> @golem15/msd-core
and golem15com/msd-core. Deep links into upstream history, sibling upstream
packages, the GSD-2 import feature, CHANGELOG.md and .changeset/ are kept as-is.
Hand edits on top: MSD block-letter banner and logos, LICENSE copyright line,
package/plugin identity, regenerated lockfile, install-tree fixtures, derived
registries and benchmark baseline; migration checksum baseline re-locked
(MSD keeps its own install state, so no install had applied the old sums);
sort-order and regex-escaped expectations in tests adjusted.
ADR-3889 terminal phase. Generated docs/reference/exit-codes.md from the exit-code declaration with a --check drift arm; deleted the inert soft-error-exit-zero oracle; promoted untyped-success from SMELL to VIOLATION so it can fail a build; pruned all 5 smell-baseline entries.
Fixed inline: two mis-scoped oracles (routing-validity, value-hygiene), a second source behind the band table, unescaped declaration strings reaching Markdown, and a pre-existing Windows 8.3 short-name path-comparison defect.
Guard ledger corrected from a claimed net -4 to a measured net -1.
Closes#3913
