refactor(tui): resume rows fold titles only, timestamp from artifact mtime

Rows no longer read logs for anything but the batch title fold: the
activity timestamp is a live session's last in-memory event time or the
artifact mtime via the optional sessionPersistence.locate(), falling
back to creation time; the last-turn, route, and goal columns are gone.
Route availability moves to the Enter-time preflight, which already
fully reads and replay-validates the one chosen log. The projectSessions
public API this PR had added to session-query is reverted — the change
is now confined to the TUI package.

scripts/type-equiv.manifest.json

@@ -459,16 +459,6 @@
       "symbol": "SessionTitleObservationResult",
       "source": "packages/session-query/session-query/src/types.ts"
     },
-    {
-      "doc": "docs/core-data-structures/session-query.md",
-      "symbol": "LogicalSessionSource",
-      "source": "packages/session-query/session-query/src/corpus.ts"
-    },
-    {
-      "doc": "docs/core-data-structures/session-query.md",
-      "symbol": "LogicalProjectionResult",
-      "source": "packages/session-query/session-query/src/corpus.ts"
-    },
     {
       "doc": "docs/core-data-structures/session-query.md",
       "symbol": "SessionEventRecord",