Make workspace authoring converge through immutable Nix candidates

Coordinate registered resource edits bottom-up into retained exact remote sources.
Use one Nix-owned source graph for provisional checking, template publication,
explicit baseline upgrades and host activation; retain independent runtime pins.

Add scoped contract inspection, historical recovery, derived worklists, crash-safe
locks, named dependency adoption and plain-QX structural editing. Repair TODO
ownership and template instantiation, and document the supported agent workflow.

Validated with protocol and command suites, real jj/Nix convergence and cache
checks, TS/React installed-command acceptance, and fresh TODO first-edit acceptance.
No live deployment or public publication performed. Props projection generation
and a one-command rich feature generator remain explicitly outside this delivery.

src/capability-language/assembly.ts

@@ -361,7 +361,7 @@ export const compileWorkspaceRepository = async (options: {
       : {}),
     ...(options.workspaceRevisionId
       ? { id: capabilityId.workspaceRevision(options.workspaceRevisionId) }
-      : {}),
+      : options.sourceRootCommit ? { id: capabilityId.workspaceRevision(`workspace-revision:${options.workspaceId ?? compiled.workspace.workspaceId}:${options.sourceRootCommit}`) } : {}),
     ...(options.sourceRootCommit
       ? { sourceRootCommit: options.sourceRootCommit }
       : {}),