* fix: normalize sessionKey=current in shared session resolution
Move the "current" alias handling from a narrow session_status-only
mapping into the shared session resolution layer so every session tool
(session_status, sessions_history, sessions_send) resolves it
consistently.
Changes:
- Register "current" as a canonical session key in looksLikeSessionKey
so it is never misclassified as a sessionId
- Normalize "current" to the requester's own session key inside
resolveSessionReference and resolveInternalSessionKey
- Add "current" normalization in session_status before local store
lookup via the existing "main" alias scoping
- Add regression tests covering both main-session and cross-agent
resolution paths
Fixes#39570
* fix: keep session_status current bound to requester
* fix: preserve literal current session targets
* fix: preserve literal current in session_status
* fix: defer current alias in session_status
* fix: scope session_status current to active store (#39574) (thanks @BryanTegomoh)
* fix: preserve literal current session previews (#39574) (thanks @BryanTegomoh)
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Co-authored-by: Ayaan Zaidi <hi@obviy.us>
* test: fix typing and test fixture issues
* Fix type-test harness issues from session routing and mock typing
* Add routing regression test for session.mainKey precedence
