Guard long-running adapter implementations

SLICE_HISTORY.md

@@ -1,5 +1,29 @@
 # Completed slices
 
+## DFG-23 process-stable adapter implementation boundary
+
+### Changed
+
+- Added a confined implementation boundary with explicit roots, files, and suffixes.
+- Inferred the project-local Python package containing a loader and included its declared
+  descriptor without requiring every existing adapter to opt in manually.
+- Fingerprinted relative implementation paths and bytes at process start under fixed file and byte
+  limits.
+- Rejected edits, additions, deletions, missing files, and unsafe replacements with
+  `adapter_restart_required` before MCP synchronization or proposal validation.
+- Returned bounded change evidence and explicit non-retryable `restart_project_server`
+  remediation.
+- Clarified that current source manifests must treat staged and unstaged deletions identically;
+  Git staging is not a synchronization operation.
+
+### Verification
+
+- Focused tests cover inferred and explicit implementation boundaries, descriptor changes, added,
+  edited, and deleted files, ignored derived files, and exact MCP remediation.
+- Strict Pyright, Ruff lint and formatting, Python compilation, and the HTML/CSS/JavaScript quality
+  gate passed.
+- The complete warning-strict suite passed 87 tests and 2 subtests.
+
 ## DFG-22 deterministic incremental adapter assembly
 
 ### Changed