SuperLocalMemory v4.2.15

A small follow-up to 4.2.14. No migration, no new settings, nothing to
re-index. The next daily refresh retires stale auto-learned prompts on its own.

Security

• Raised the floors for four packages SuperLocalMemory pulls in indirectly,
  so clean installs and upgrades both get the patched releases: filelock
  4.2.1 or later (via huggingface_hub, torch, transformers), dnspython 2.9.0
  or later (via email-validator), opentelemetry-api 1.45.1 or later (via
  mcp) and setuptools 84.1.0 or later (via torch). SuperLocalMemory does not
  import any of them directly.

Fixed

• Old auto-learned prompts were never retired, so sessions kept starting
  with them. Every daily refresh of the auto-learned "soft prompts" stopped
  with a database error before its clean-up step: it tried to store a category
  the table does not accept. Nothing reported it, so a prompt like "The user's
  preferred technology stack includes: file, session, ended, ..." stayed
  active for months and every session started with it. The refresh now only
  produces categories the store accepts, the clean-up always runs, and old
  prompts are retired on the next refresh.
• Session start no longer includes tool-usage statistics ("frequently uses
  Read (6816 times)"). They are still recorded and shown on the dashboard.
• A copied session marker in the form "the session ended " is now
  recognised as bookkeeping, like the other marker forms.