docs(openspec): backfill missing proposals

openspec/changes/update-ide-auth-compat-1165/tasks.md

@@ -0,0 +1,19 @@
+## 1. Scope and Planning Confirmation
+
+- [x] 1.1 Review `proposal.md`.
+- [x] 1.2 Confirm this stage covers default runtime configuration path only.
+- [x] 1.3 Define behavior-consistency constraints.
+
+## 2. Implementation
+
+- [x] 2.1 Add IDE version-detection module.
+- [x] 2.2 Add encode/decode support for new-format OAuth token.
+- [x] 2.3 Add routed injection logic and dual-write fallback on detection failure.
+- [x] 2.4 Prefer new format for account detection, with legacy fallback.
+- [x] 2.5 Extend backup/restore to cover new-format keys.
+
+## 3. Verification
+
+- [ ] 3.1 Self-test injection paths for both new and legacy formats.
+- [ ] 3.2 Verify dual-write behavior when version detection fails.
+- [ ] 3.3 Verify account availability after backup/restore.