Problem: `logger.log` positional args were hard to extend, and adding
`sync` support for pre-block notifications required a clean API. Test
stream completion had no user-visible signal. `setup_contest` could
silently overwrite files when a user's `filename` config returned
colliding paths.
Solution: Replace `(msg, level, override)` with `(msg, LogOpts?)` where
`LogOpts` carries `level`, `override`, and `sync`. Sync path calls
`vim.notify` directly; async path uses `vim.schedule` as before. Add
`on_done` callback to `scrape_all_tests`, fired via `on_exit` and
surfaced as a "Loaded N tests." notification. Detect filename collisions
in `proceed()` before touching the filesystem. Migrate all call sites.
Add stress.lua that auto-detects or accepts generator and brute solution
files, compiles C++ if needed, and launches scripts/stress.py in a
terminal buffer with session save/restore and cleanup autocmds.
Add scripts/stress.py as a standalone loop that runs generator → brute →
candidate, comparing outputs and exiting on the first mismatch.
