Remove memory_consolidation_job and all references

Remove the nightly memory consolidation job and all references to it. ## Files to Update/Delete **DELETE:** - `app/jobs/memory_consolidation_job.rb` - `spec/jobs/memory_consolidation_job_spec.rb` **UPDATE:** - `docs/AGENT_ARCHITECTURE.md` - Remove mentions of memory_consolidation_job ## Notes - The job queried tickets with `working_memory->>'consolidated' IS NULL` but since working_memory is not being removed, no migration needed for that - The job stored consolidated memories in AgentMemory - any existing consolidated memories can remain (historical data)