docs(openspec): backfill missing proposals

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

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+# Change: IDE Auth Compatibility Fix for 1.16.5+
+
+## Why
+
+- The target IDE changed OAuth token persistence format starting from 1.16.5.
+- The current JS implementation only supports the legacy format, causing account detection and switching failures.
+- The verified behavior needs to be fully migrated into the current code path to reduce regression risk.
+
+## What Changes
+
+- Add IDE version detection and route injection by legacy/new format.
+- Support encoding/decoding and account detection for the new OAuth token format.
+- Apply dual-write fallback (legacy + new) when version detection fails.
+- Extend backup/restore logic to include new-format keys.
+
+## Constraints
+
+- Keep existing behavior semantics; do not introduce new strategy layers or business fields.
+- This stage only covers the default runtime configuration path.
+
+## Impact
+
+- Affected specs: `ide-auth-compat`
+- Affected code:
+  - `src/ipc/database/cloudHandler.ts`
+  - `src/utils/protobuf.ts`
+  - `src/ipc/database/handler.ts`
+  - `src/utils/paths.ts`
+
+## Risks
+
+- Protobuf encoding/decoding mismatch may break injection or parsing.
+- Version detection failure may route to the wrong injection path.
+- DB lock conflicts during injection may cause write failures.