Ddd audit

[folkengine]

Features

• New entropy feature. It is on by default. Without it, the core build uses no OS randomness (no getrandom).
• New persistence feature. It holds the file save and load code.
• New json, csv and full features. full gives back the old default set.
• New "twin" functions that take an id or an RNG (random number maker) as input. Examples: Table::*_with_id, Player::with_id, act_shuffle_deck_with,
  PokerSession::start_hand_with / run_hand_with.
• New Pluribus::parse_log(text). It reads a log from text, not from a file.
• New SimTable::DEFAULT_SEED and EquityOptions::DEFAULT_SEED.

Breaking changes

• The default features are now small: equity, player-stats, hup-charts. YAML, rayon, JSON and CSV are off by default.
• BotDecider::decide_seeded is now the method you must write. decide is now a built-in helper.
• The console input helpers now need the terminal feature.
• The embedded heads-up chart code now needs hup-charts.
• Callers that turn off default features must add entropy. Known callers: pkwasm, pkarena0-web, cardroom.

Fixes

• A replay now gives the same Table every time. Ids come from the record, not from chance.
• Table::default() now writes the nil id to the event log. Before, it wrote a random id.
• Nubificus::get_log_files is now behind persistence.
• make generate-hups-bin works again.

Refactors

• SimTable always holds its own RNG.
• Removed util::name and the random_name_generator dependency.
• Removed Util::read_lines and Util::commentary_action_to.
• The perf/ crate uses fixed ids. Its Cargo.lock is much smaller.

Config / docs / tests

• make check-purity is stricter. It fails on getrandom, csv, serde_json and clap in the small builds.
• The Makefile and CI now use --features full. They also check each feature by itself.
• Examples now list the features they need.
• New tests/kernel_determinism.rs. It tests the core build with no entropy.
• New docs/KERNEL_PURITY