feat(releaser): add --verbose flag for configuration and decision tracing

- Prints a configuration table on startup showing each key, its value,
  and the source (default / config file / env: VARNAME / flag: --name)
- Lists every commit since the last tag with its parsed type and
  the version-bump decision (feat/fix/breaking → patch bump, or ignored)
- Explains the final version choice: highest commit type → next tag
- All verbose output goes to stderr so it never pollutes stdout captures
- Sources tracking wired through config.LoadWithSources and
  ApplyEnvWithSources; LoadWithSources uses a two-pass approach to
  detect which YAML fields were explicitly set vs defaulted

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

CHANGELOG.md

@@ -3,6 +3,12 @@
 All notable changes to this project will be documented in this file.
 Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [1.1.1] - 2026-07-07
+
+### Added
+
+- **`--verbose` flag** — prints configuration table (each key, value, and source: `default` / `config file` / `env: VARNAME` / `flag: --name`), lists every commit since the last tag with its parsed type and version-bump decision, and explains the final version choice; output goes to stderr so it never pollutes scripts that capture stdout
+
 ## [1.1.0] - 2026-07-07
 
 ### Added