docs(0.9): release notes, cookbook recipe, README polish

Companion to the feat(explorer) commit. Bumps the version and
brings every cross-referencing doc up to v0.9 currency.

- Cargo.toml: version 0.8.0 -> 0.9.0.
- CHANGELOG: 0.9.0 entry covering the explorer export, the
  Problem-side metadata additions, the AlgorithmInfo trait, the
  pick_a_car example, and the new cookbook recipe.
- README: closing paragraph of the PickACar example points users
  at the explorer with a one-call snippet
  (`ExplorerExport::from_result(...).with_algorithm_info(...)
  .to_file(...)?`). Version snippets bumped 0.8 -> 0.9.
- New cookbook recipe at docs/book/src/cookbook/explorer.md
  covering: enabling the serde feature, enriching Problem with
  labels/units/decision-schema, the export call, the JSON schema,
  and custom decision-type handling.
- SUMMARY.md and cookbook.md link the new recipe.
- migration.md: new "To 0.9" section documenting the additive
  changes (purely backwards-compatible upgrade from 0.8.x).
- introduction.md, comparison.md, choosing-an-algorithm.md,
  stability.md: version refs bumped 0.8 -> 0.9.
- cookbook/parallel.md, cookbook/async.md: version refs bumped
  0.8 -> 0.9.
- getting-started.md: version refs bumped, serde feature
  description expanded to mention the explorer module.
- SECURITY.md: supported-versions table moves to 0.9.x.

docs/book/src/cookbook/async.md

@@ -13,7 +13,7 @@ evaluation path.
 
 ```toml
 [dependencies]
-heuropt = { version = "0.8", features = ["async"] }
+heuropt = { version = "0.10", features = ["async"] }
 
 # Pick whatever async runtime you want; heuropt itself depends only on
 # `futures`. The example below uses tokio.
@@ -112,8 +112,8 @@ results back to the algorithm.
 
 ## What the worked example shows
 
-`examples/async_eval.rs` runs `RandomSearch` (200 evaluations × 20 ms
-each) at `concurrency = 1, 4, 16` and `DifferentialEvolution` at
+`examples/async_eval.rs` runs Random Search (200 evaluations × 20 ms
+each) at `concurrency = 1, 4, 16` and Differential Evolution at
 `concurrency = 8`. On a recent machine:
 
 ```text