feat(console): add structured error handling, verbosity, and suggestions

Implement Phase 7.2 error handling & UX infrastructure:

- Add exit_code module with MozartError, bail()/bail_silent() helpers,
  and Composer-compatible exit code constants (0-5, 100)
- Redesign Console struct with Verbosity enum (Quiet/Normal/Verbose/
  VeryVerbose/Debug), ANSI auto-detection via IsTerminal, and
  verbosity-gated output methods (info/verbose/debug/error)
- Thread Console through all 33 command execute() signatures
- Replace all std::process::exit() calls with structured MozartError
  returns handled in main()
- Migrate eprintln\! status messages to console.info() for quiet-mode
  suppression
- Add suggest module with Levenshtein distance and "Did you mean?"
  formatting for future package name suggestions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/crates/mozart/src/lib.rs b/crates/mozart/src/lib.rs
index d28ff9c..4275833 100644
--- a/crates/mozart/src/lib.rs
+++ b/crates/mozart/src/lib.rs
@@ -5,6 +5,7 @@ pub mod commands;
 pub mod console;
 pub mod constraint;
 pub mod downloader;
+pub mod exit_code;
 pub mod installed;
 pub mod lockfile;
 pub mod package;
@@ -12,6 +13,7 @@ pub mod packagist;
 pub mod php_scanner;
 pub mod platform;
 pub mod resolver;
+pub mod suggest;
 pub mod validation;
 pub mod version;
 pub mod version_bumper;