Fix baserunner resolution for Error, FieldersChoice, and DoublePlay

[JakenHerman]

Resolves #2

Centralize baserunner logic for the three play types that previously produced inconsistent scorebook state.

• Error: use force-advance semantics so a runner on first is preserved (was being overwritten by the batter). Bases-loaded errors now score the runner from third, still as an unearned run.
• FieldersChoice: retire the lead forced runner (or the lead runner on base when no force exists) and advance trailing forced runners, instead of always clearing whichever highest base happened to be occupied.
• DoublePlay: retire the runner forced from first on a standard ground- ball DP; fall back to retiring the lead runner on base for line-drive double-offs. Other runners stay put and the batter is not placed on any base.

The FC and DP logic lives on Bases (resolve_fielders_choice, resolve_double_play) so it can be reused outside of at-bat resolution.

Adds focused tests covering representative runner configurations for each play type (runner on 1st, 1st & 2nd, 1st & 3rd, bases loaded, non-forced cases, and direct Bases-helper tests).

[Copilot]

Pull request overview

Fixes incorrect baserunner state transitions for Error, FieldersChoice, and DoublePlay by centralizing runner-resolution logic in Bases, and adds regression tests for representative runner configurations.

Changes:

• Add Bases::resolve_fielders_choice and Bases::resolve_double_play, and use them during at-bat resolution.
• Change Error handling to use force_advance semantics so forced runners advance and bases-loaded errors can score a run.
• Add/update documentation and release-related project metadata (README install/release notes, Cargo.toml package fields, changelog, release workflow).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/game.rs	Centralizes FC/DP baserunner logic; updates Error handling to preserve/advance forced runners; adds focused tests.
README.md	Adds install instructions for prebuilt binaries and maintainer release steps; links changelog.
Cargo.toml	Adds package metadata including rust-version, license, repository, and readme.
CHANGELOG.md	Introduces a Keep-a-Changelog formatted changelog with initial release notes.
.github/workflows/release.yml	Adds a tag-triggered workflow to build and attach release artifacts for major platforms.

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