Same title consolidation produces duplicate and orphaned memories

[abhinav-m22]

The consolidation process does not check newly created memories during a run, causing duplicate active memories and orphaned entries when titles collide.

In src/functions/consolidate.ts, the code reads a snapshot of existing memories into the existingMemories array and initializes a Set named existingTitles.
Although new memory titles are added to this Set, the deduplication check on line 169 only searches the stale existingMemories array, rendering existingTitles unused dead code.

If multiple concept groups in the same run generate the same memory title, the second group will not find the newly created memory.
Instead of updating the existing memory, it creates duplicate active memories with identical titles and breaks the parent relationship chain.

[MarvinFS]

I opened #748 to fix this.

Confirmed the root cause exactly as you described: existingMemories (src/functions/consolidate.ts:114) is a snapshot taken once before the concept-group loop and never refreshed, while the existingTitles Set is written on every create/evolve but never read - so the dedup .find() at line 169 only ever sees stale state. When two concept groups in one run synthesize the same title, the second misses the just-created memory, takes the create branch, and writes a second isLatest memory with no parentId - the duplicate + orphaned predecessor.

The PR keeps the snapshot live rather than carrying the unused index: it removes the dead existingTitles Set, pushes each newly created memory into existingMemories, and on evolve replaces the matched predecessor in place. In-place replacement (not append) matters because the title match doesn't filter on isLatest - leaving the superseded row in the array would let a third same-title group re-match it and recreate a second latest. The existing cross-project guard is untouched.

It adds two regression tests to test/consolidate-project-scope.test.ts (a two-group and a three-group same-title collision in a single run) that are red on current main and green with the fix.