diff --git a/architecture/autodesk-launcher/README.md b/architecture/autodesk-launcher/README.md
index d2020a1..4eab522 100644
--- a/architecture/autodesk-launcher/README.md
+++ b/architecture/autodesk-launcher/README.md
@@ -4,4 +4,4 @@ This section is the single architecture record for the corporate Autodesk launch
 
 The AS-IS flow is a locally synchronized legacy deployment with generated AutoLISP loading. Launcher Next is a .NET 8, one-visible-EXE design that stages signed-by-hash local packages and loads one managed entry assembly. It is a design/foundation only: production configuration, AutoCAD profiles, trusted paths, network roots and deploys were not changed.
 
-See [AS-IS](as-is/system-context.md), [target](target/architecture.md), [ADRs](adr/ADR-001-parallel-rewrite.md), and [evidence map](evidence-map.csv).
+See [AS-IS](as-is/system-context.md), [target](target/architecture.md), [legacy compatibility and pilot](target/legacy-compatibility.md), [ADRs](adr/ADR-001-parallel-rewrite.md), and [evidence map](evidence-map.csv).
diff --git a/architecture/autodesk-launcher/as-is/performance-profile.md b/architecture/autodesk-launcher/as-is/performance-profile.md
index d86893f..e919035 100644
--- a/architecture/autodesk-launcher/as-is/performance-profile.md
+++ b/architecture/autodesk-launcher/as-is/performance-profile.md
@@ -1,3 +1,27 @@
 # AS-IS performance profile
 
-The startup path performs network-dependent synchronization when installer/update is used, writes generated LISP files, starts a batch and may load 20 assemblies sequentially. No timings were collected; claims about latency, parallelism, cache hit rate, or behavior under unavailable network are `UNKNOWN`. Launcher Next must measure these rather than infer them.
+The startup path performs network-dependent synchronization when installer/update is used, writes generated LISP files, starts a batch and may load 20 assemblies sequentially. No timings were collected; claims about latency, parallelism, cache hit rate, or behavior under unavailable network are `UNKNOWN`.
+
+| Source-level observation | Evidence | Performance implication | Confidence |
+|---|---|---|---|
+| Installer recursively copies selected catalogs and can delete files/directories | `All_Serv_Install/Form1.cs` copy path | filesystem and potentially network traversal; UI blocking behavior requires measurement | CONFIRMED |
+| Updater computes MD5/control sums and replaces local files | `All_Serv_InstallUpdater/Form1.cs` | repeat hash/read/copy work; no measured count or time | CONFIRMED |
+| Bootstrap emits one generated loader command per selected installed catalog | `P_Serv_Starter/Program.cs` | sequential startup work grows with selected modules | CONFIRMED |
+| OrthoLoader sequentially `. _netload`s 20 configured modules | legacy loading audit | 20 managed loads before all functionality is ready | CONFIRMED |
+| Repeated load on document/workspace events | no complete event evidence | cannot assert | UNKNOWN |
+
+No measured count is claimed for network requests, full copies, UI waits, `Process.WaitForExit`, `Thread.Sleep`, or repeated document-level loading. Those are measurement subjects, not observed facts.
+
+## Measurement plan (proposed)
+
+| Scenario | Start | End | Proposed metrics |
+|---|---|---|---|
+| Cold start | launcher action | Ribbon ready | elapsed time, files hashed/copied, bytes, NETLOAD count |
+| Warm start | launcher action | Ribbon ready | cache hit, network requests, elapsed time |
+| Offline start | launcher action with network unavailable | Plant prepared/started | valid cache use, retry count, user status |
+| No-update start | catalog read | launch prepared | manifest comparison and file operations |
+| Update start | catalog read | activation complete | staging time, hash time, atomic switch time |
+| Rollback | rollback request | previous pointer active | elapsed time and success/failure |
+| Plugin readiness | Plant process created | Initialize and Ribbon ready | process-start, entry-load, command/Ribbon timestamps |
+
+Targets are **PROPOSED** until baseline data is collected: one entry NETLOAD, zero network assembly loads, zero in-place replacement of active package files, and no repeated full copy on a valid no-update start.
diff --git a/architecture/autodesk-launcher/target/legacy-compatibility.md b/architecture/autodesk-launcher/target/legacy-compatibility.md
new file mode 100644
index 0000000..8f43578
--- /dev/null
+++ b/architecture/autodesk-launcher/target/legacy-compatibility.md
@@ -0,0 +1,36 @@
+# Legacy compatibility and pilot contract
+
+## Required user-facing behavior
+
+| Legacy behavior | Preserve in Next | Pilot status |
+|---|---|---|
+| Product/project selection workflow | preserve after separate UX analysis | not implemented |
+| Plant 3D version discovery | preserve through adapter/override | foundation adapter |
+| Local corporate plugin availability | preserve through valid local cache | designed/tested locally |
+| P_Rec commands and Ribbon | preserve through one managed entry assembly | plugin-owned, not launched here |
+| Immediate legacy return | preserve `LauncherMode=Legacy` | designed |
+| Other legacy plugins | retain existing chain until individually migrated | required |
+
+## Can be removed only for migrated P_Rec_Annot
+
+- OrthoLoader configuration fan-out and twenty sequential `NETLOAD` calls.
+- Generated LISP/BAT as the package-loading mechanism, once explicit Next startup is runtime-proven.
+- Per-file legacy copy replacing an active module directory.
+
+They remain necessary for other legacy corporate plugins until those plugins have their own migration and acceptance evidence.
+
+## Duplicated or avoidable work
+
+The source shows installer recursive copy/delete, updater hash/copy work, generated LISP generation and twenty sequential module loads. The precise overlap and cost require measurement. Next reduces avoidable work by comparing manifests, reusing a valid local version, staging only a new version and loading one entry assembly. It must not claim that legacy runs these actions on every AutoCAD startup without runtime evidence.
+
+## P_Rec_Annot pilot
+
+The pilot is a dry-run contract only:
+
+```text
+discover Plant 3D 2026 -> validate fixture manifest -> local test-source staging
+-> activate version pointer -> build one startup NETLOAD script
+-> construct ProcessStartInfo -> do not start process
+```
+
+It uses a fixture manifest with a synthetic SHA-256 and a test-created placeholder file. No real bundle, Plant assembly, package cache or production catalog is included.