Implement workspace evolution, migrations, and runtime continuity

Enable evolution by default for source-backed workspaces. Add stable
conformance ownership, semantic-major review, candidate typechecking,
and durable fenced cutover with explicit migrations and forward recovery.

Independently supervise package runtimes so unchanged resource owners keep
their processes and connections across cutover. Add scoped invocation
authority, resource sessions, and typed callback rebinding.

Wire opaque object references through generated bindings and RPCs. Add
canonical relationship sets, keyed maps, and ordered lists with scoped
transactional mutations, revision checks, and inverse consistency. Support
planned cascade deletion, protection, tombstones, and lifecycle foundations.

Add journaled structural edits, package/function/migration scaffolding,
managed repository creation, and resumable bottom-up dependency pin
publication. Document lifetime boundaries, revision pinning, prototype
compatibility policy, commands, and deferred work.

Validate with 210 tests, user-systemd process/connection continuity,
generated-package TypeScript checks, and Nix host/protocol checks.
TTL handoff, physical reclamation, general multi-step migrations, and
root-systemd migration isolation acceptance remain deferred.

check-receipt.mjs

@@ -0,0 +1,17 @@
+import fs from "node:fs";
+import crypto from "node:crypto";
+const [schemaPath, packageRevisionId, bindingOutput, generatorPath, output] = process.argv.slice(2);
+if (!schemaPath || !packageRevisionId || !bindingOutput || !generatorPath || !output) throw new Error("Missing candidate check receipt inputs");
+const canonical = (value) => Array.isArray(value) ? value.map(canonical) : value && typeof value === "object"
+  ? Object.fromEntries(Object.entries(value).sort(([a], [b]) => a < b ? -1 : a > b ? 1 : 0).map(([key, entry]) => [key, canonical(entry)])) : value;
+const hash = (value) => `sha256:${crypto.createHash("sha256").update(JSON.stringify(canonical(value))).digest("hex")}`;
+const schema = JSON.parse(fs.readFileSync(schemaPath, "utf8"));
+if (!schema.packages.some((entry) => entry.revisionId === packageRevisionId)) throw new Error("Checked binding schema lacks the package");
+const generated = fs.readFileSync(bindingOutput, "utf8");
+if (generated !== fs.readFileSync(".qx-checked-bindings", "utf8")) throw new Error("Build replaced candidate-generated bindings; its check is not evidence for this candidate");
+const receipt = {
+  schemaVersion: 1, packageRevisionId, success: true, bindingSchema: schema,
+  bindingSchemaDigest: hash(schema), generatedDigest: hash(generated),
+  checkerDigest: hash({ generatorPath, compiler: JSON.parse(fs.readFileSync("node_modules/typescript/package.json", "utf8")), lock: fs.readFileSync("yarn.lock", "utf8") }),
+};
+fs.writeFileSync(output, `${JSON.stringify(receipt, null, 2)}\n`, { flag: "wx" });

quixos-package-helpers.nix

@@ -539,6 +539,9 @@ EOF
       # An exact, compiler-produced BindingSchema JSON artifact and a backend.
       # Other language helpers can consume the same schema with their own generator/runtime.
       bindings ? null,
+      # A dedicated entrypoint calling SDK serveMigration; never start the
+      # normal package server in the isolated migration execution boundary.
+      migrationEntrypoint ? null,
       nativeBuildInputs ? [ ],
       devShellPackages ? [ ],
       devShellHook ? "",
@@ -661,6 +664,17 @@ EOF
             ${lib.optionalString (installConfig ? descriptorPath && descriptorPath != null) ''
               cp ${lib.escapeShellArg descriptorPath} "$out/${descriptorPath}"
             ''}
+            ${lib.optionalString (bindingConfig != null) ''
+              install -m 0444 quixos-check.json "$out/quixos-check.json"
+            ''}
+            ${lib.optionalString (migrationEntrypoint != null) ''
+              install -Dm444 migration.mjs "$out/libexec/${serverLibexecName}/migration.mjs"
+              cat > "$out/bin/migrate" <<EOF
+#!${pkgs.runtimeShell}
+exec ${nodejs}/bin/node --max-old-space-size=256 "$out/libexec/${serverLibexecName}/migration.mjs" "\$@"
+EOF
+              chmod +x "$out/bin/migrate"
+            ''}
             runHook postInstall
           '';
 
@@ -669,15 +683,26 @@ EOF
           overrideAttrs = old: {
             nativeBuildInputs =
               (old.nativeBuildInputs or [ ])
-              ++ lib.optional (bundle != null) pkgs.esbuild
+              ++ lib.optional (bundle != null || migrationEntrypoint != null) pkgs.esbuild
               ++ callOption nativeBuildInputs;
             buildPhase = ''
               runHook preBuild
               ${exportsFor (callOption buildEnv)}
               ${bindingCommand}
               ${lib.optionalString (bindingConfig != null) "yarn exec tsc --noEmit"}
+              ${lib.optionalString (bindingConfig != null) "cp ${lib.escapeShellArg bindingOutput} .qx-checked-bindings"}
               ${buildCommand}
+              ${lib.optionalString (bindingConfig != null) ''
+                yarn exec tsc --noEmit
+                node ${./check-receipt.mjs} ${lib.escapeShellArg (toString bindingSchema)} \
+                  ${lib.escapeShellArg bindingConfig.packageRevisionId} ${lib.escapeShellArg bindingOutput} \
+                  ${lib.escapeShellArg (toString bindingConfig.generator)} quixos-check.json
+              ''}
               ${bundleCommand}
+              ${lib.optionalString (migrationEntrypoint != null) ''
+                esbuild ${lib.escapeShellArg migrationEntrypoint} --bundle --platform=node --target=node24 --format=esm \
+                  ${bundleAliasArgs} --preserve-symlinks --banner:js=${lib.escapeShellArg nodeRequireBanner} --outfile=migration.mjs
+              ''}
               runHook postBuild
             '';
           } // lib.optionalAttrs (installServerPhase != null) {