docs: add plugin-v2 scope isolation fix plan and test criteria

Author: Thomas Tupper

SCOPE_ISOLATION_FIX_PLAN.md

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+# Scope Isolation Fix Plan (plugin-v2)
+
+## Problem
+Session and long-term recalls can leak across scopes in some flows.
+
+## Desired behavior
+- `scope=session` => query with `run_id` only
+- `scope=long-term` => query with `user_id` only
+- `scope=all` => merge session+long-term and de-dup deterministically
+
+## Patch steps
+1. Enforce strict id routing in provider methods (`search`, `getAll`, `add` where applicable).
+2. Add guard rails that reject ambiguous scope+id combinations.
+3. Add smoke tests:
+   - write session marker, verify absent from long-term search
+   - write long-term marker, verify absent from session search
+   - verify scope=all returns both
+
+## Done criteria
+- Scope leakage tests pass twice in a row against live R720 API.
+- Dashboard scope views align with tool-level scope results.