fix(sampler): deterministic parameter matching in TPE

When two parameters share the same Distribution (e.g. two
FloatParam::new(-5.0, 5.0) in one study), TpeSampler iterated
trial.distributions (a HashMap) with find_map to extract a value
matching the target distribution. HashMap iteration order varies
across runs, so x's history could be conflated with y's history
non-deterministically — making seeded TPE runs flaky in parallel
test execution.

Pick the smallest-ParamId match instead, so the choice is stable
across runs.

Also:
- src/sampler/genetic.rs: collapse if into match guard (clippy)
- src/lib.rs: drop std_instead_of_core lint (the only remaining
  hits are std::io::Error/ErrorKind, which have no stable core
  equivalent yet)
- Cargo.toml: relax minimum versions for fastrand/tokio/tracing/
  optimizer-derive; bump dev-dep tokio to 1.50 to match in-tree usage

Cargo.toml

@@ -16,14 +16,14 @@ categories = ["algorithms", "science", "mathematics"]
 readme = "README.md"
 
 [dependencies]
-fastrand = "2.3"
+fastrand = "2"
 thiserror = "2"
 parking_lot = "0.12"
-tokio = { version = "1.30", features = ["sync", "rt-multi-thread"], optional = true }
-optimizer-derive = { version = "0.1.0", path = "optimizer-derive", optional = true }
+tokio = { version = "1", features = ["sync", "rt-multi-thread"], optional = true }
+optimizer-derive = { version = "0.1", path = "optimizer-derive", optional = true }
 serde = { version = "1", features = ["derive"], optional = true }
 serde_json = { version = "1", optional = true }
-tracing = { version = "0.1.29", optional = true }
+tracing = { version = "0.1", optional = true }
 sobol_burley = { version = "0.5", optional = true }
 nalgebra = { version = "0.34", optional = true }
 fs2 = { version = "0.4", optional = true }
@@ -40,7 +40,7 @@ cma-es = ["dep:nalgebra"]
 gp = ["dep:nalgebra"]
 
 [dev-dependencies]
-tokio = { version = "1.30", features = ["rt-multi-thread", "macros", "time"] }
+tokio = { version = "1.50", features = ["rt-multi-thread", "macros", "time"] }
 optimizer-derive = { version = "0.1.0", path = "optimizer-derive" }
 serde_json = "1"
 criterion = { version = "0.8", features = ["html_reports"] }