Reserved workspace slugs lived in two parallel files (`workspace_reserved_slugs.go`
and `packages/core/paths/reserved-slugs.ts`) with no parity check. Adding or
renaming a global route on one side without the other would slip through CI
and surface only when a real user hit the collision.
Collapse the two lists into one source: `server/internal/handler/reserved_slugs.json`.
Go embeds the JSON via `//go:embed` and parses it at package init; the TS file
is regenerated by `scripts/generate-reserved-slugs.mjs` (run via
`pnpm generate:reserved-slugs`). CI re-runs the generator and `git diff
--exit-code`s the TS output, so a stale TS file cannot land. The slug set is
unchanged (87 entries, byte-equivalent slug literals).
Update CLAUDE.md to describe the new "edit JSON, run generator" workflow.
Co-authored-by: multica-agent <github@multica.ai>
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