v0.1.2 add file support for custom vocabulary

[0.1.2] - 2026-07-30

Added

• --file / -f CLI option on ste100-mcp (repeatable): pass one or more
  *.jsonl vocabulary files at startup. Paths are merged with those from
  STE100_MCP_FILES; duplicates are removed while preserving order.
• Factory class in settings.py — thread-safe singleton for
  Settings using a double-checked lock. Class-level state removes the
  need for a module-level global variable.
  • Factory.create_instance(extra_files) — creates the singleton, merges
    CLI-supplied paths with env-supplied paths, asserts it is called only once.
  • Factory.get_instance() — returns the singleton, asserts
    create_instance was called first.
• tests/settings/test_factory.py — 8 unit tests covering singleton
  creation, identity, deduplication, and both AssertionError guard paths.

Changed

• cli.py calls Factory.create_instance(files or []) before mcp.run()
  so CLI-supplied paths are available to the server lifespan.
• server.py _lifespan calls Factory.get_instance() instead of
  constructing a new Settings() on every startup.

Fixed

• Removed bogus --file validation block in cli.py that called
  load_dotenv instead of exiting on error (Typer's exists=True already
  rejects non-existent paths).
• Changed --file default from mutable [] to None to avoid the
  mutable-default-argument footgun.

Full Changelog: v0.1.1...v0.1.2