[1/n] [dropshot-api-manager] redesign compatibility issue output

Based on the improvements in drift 0.2, redesign the way we display compatibility issues to show all the endpoints from which a component is accessible.

This is a pretty major rework of the compatibility detection and display code, though I hope it's relatively straightforward.

The output looks quite nice! Here's an example as of this PR:

<img width="1606" height="636" alt="image" src="https://github.com/user-attachments/assets/f46ee2c1-c872-4e1f-8cd4-f5afd0bb6519" />

More improvements to this will come in subsequent PRs (split them up to make it easier to review.)

Reviewers: david-crespo

Reviewed By: david-crespo

Pull Request: #95

Author: sunshowers

AGENTS.md

@@ -224,7 +224,11 @@ crates/
 │   │   ├── cmd/                   # CLI commands (dispatch, check, generate, list, debug)
 │   │   ├── environment.rs         # Environment configuration and resolution
 │   │   ├── resolved.rs            # Resolution logic, VersionProblem / NonVersionProblem / Fix enums
-│   │   ├── compatibility.rs       # Wire compatibility checking via drift
+│   │   ├── compatibility/         # Wire compatibility checking via drift
+│   │   │   ├── mod.rs             # Module re-exports
+│   │   │   ├── types.rs           # ApiCompatIssue and related data model
+│   │   │   ├── detect.rs          # Bridge from drift output into the data model
+│   │   │   └── display.rs         # Styled CLI rendering of compatibility issues
 │   │   ├── validation.rs          # OpenAPI document validation
 │   │   ├── vcs/                   # VCS abstraction (RepoVcs: Git/Jujutsu dispatch)
 │   │   │   ├── mod.rs             # Module re-exports

Cargo.lock

@@ -38,6 +38,7 @@ thiserror.workspace = true
 
 [dev-dependencies]
 assert_matches.workspace = true
+expectorate.workspace = true
 
 [lints]
 workspace = true