docs: add complete project and crate run guides

[404khai]

Roadrunner had no root or crate READMEs, leaving setup and executable workflows scattered across phase documentation. Add a project guide and a README for each of the five crates, with commands grounded in the merged Phase 17 implementation.

The guides cover toolchain setup, all current CLI commands, OSM extraction/compilation/verification, static and time-dependent traffic, single-order and pooled simulation, dispatch comparison and examples, tests, API docs, all six Criterion targets, replay and benchmark collectors. Crate guides describe public interfaces and module boundaries. Examples specify repository-root invocation, source OSM endpoints, exact source identities required by traffic fixtures, and fresh snapshot output directories.

Document optional Docker/Python OSM prerequisites, versioned scenario semantics, and deferred functionality. Explain that the historical Phase 7 assembler embeds old metadata and align the rider collector's compiler metadata with its benchmark toolchain. This PR changes documentation only; Phase 18 remains deferred.

Validation:

• Verified all 72 relative README links and heading anchors.
• Executed documented root and crate OSM/routing workflows, static/time-dependent traffic, simulation and dispatch comparison commands, plus both dispatch examples.
• Passed all six Criterion targets in smoke mode; these checks are not new statistical benchmark measurements.
• Ran all three simulation/strategy/pooling collectors with two measured runs each; replay and all 11 pooled fixtures passed their collector checks.
• Passed API documentation generation and three Python reference-comparison unit tests.
• Passed cargo fmt --all -- --check, strict workspace Clippy, and all 159 workspace tests with Rust 1.99.0 for Clippy/tests.
• Optional Docker/OSRM integration and Python osmium fixture generation were not executed; their command signatures and prerequisites were checked.