feat: add automated dependency bump checker and changelog validator

Introduces a new tool to automatically detect dependency version changes
and validate/update changelog entries accordingly.

Features:
- Detects dependency bumps from git diffs in package.json files
- Validates changelog entries with exact version matching
- Automatically updates changelogs with missing or outdated entries
- Smart PR reference concatenation when updating existing entries
- Dynamically reads repository URLs and package names
- Validates by default with optional --fix flag for updates

Usage:
  yarn check-dependency-bumps           # Validate changelogs
  yarn check-dependency-bumps --fix     # Auto-update changelogs
  yarn check-dependency-bumps --fix --pr 1234  # With PR number

src/command-line-arguments.ts

@@ -1,16 +1,32 @@
 import yargs from 'yargs/yargs';
 import { hideBin } from 'yargs/helpers';
 
-export type CommandLineArguments = {
+export type ReleaseCommandArguments = {
+  _: string[];
+  command: 'release';
   projectDirectory: string;
-  tempDirectory: string | undefined;
+  tempDirectory?: string;
   reset: boolean;
   backport: boolean;
   defaultBranch: string;
   interactive: boolean;
   port: number;
 };
 
+export type CheckDepsCommandArguments = {
+  _: string[];
+  command: 'check-deps';
+  fromRef?: string;
+  toRef?: string;
+  defaultBranch: string;
+  fix?: boolean;
+  pr?: string;
+};
+
+export type CommandLineArguments =
+  | ReleaseCommandArguments
+  | CheckDepsCommandArguments;
+
 /**
  * Parses the arguments provided on the command line using `yargs`.
  *
@@ -21,52 +37,118 @@ export type CommandLineArguments = {
 export async function readCommandLineArguments(
   argv: string[],
 ): Promise<CommandLineArguments> {
-  return await yargs(hideBin(argv))
-    .usage(
-      'This tool prepares your project for a new release by bumping versions and updating changelogs.',
+  const args = await yargs(hideBin(argv))
+    .scriptName('create-release-branch')
+    .usage('$0 <command> [options]')
+    .command(
+      ['release', '$0'],
+      'Prepare your project for a new release by bumping versions and updating changelogs',
+      (commandYargs) =>
+        commandYargs
+          .option('project-directory', {
+            alias: 'd',
+            describe: 'The directory that holds your project.',
+            default: '.',
+          })
+          .option('temp-directory', {
+            describe:
+              'The directory that is used to hold temporary files, such as the release spec template.',
+            type: 'string',
+          })
+          .option('reset', {
+            describe:
+              'Removes any cached files from a previous run that may have been created.',
+            type: 'boolean',
+            default: false,
+          })
+          .option('backport', {
+            describe:
+              'Instructs the tool to bump the second part of the version rather than the first for a backport release.',
+            type: 'boolean',
+            default: false,
+          })
+          .option('default-branch', {
+            alias: 'b',
+            describe: 'The name of the default branch in the repository.',
+            default: 'main',
+            type: 'string',
+          })
+          .option('interactive', {
+            alias: 'i',
+            describe:
+              'Start an interactive web UI for selecting package versions to release',
+            type: 'boolean',
+            default: false,
+          })
+          .option('port', {
+            describe:
+              'Port to run the interactive web UI server (only used with --interactive)',
+            type: 'number',
+            default: 3000,
+          }),
+    )
+    .command(
+      'check-deps',
+      'Check dependency version bumps between git references',
+      (commandYargs) =>
+        commandYargs
+          .option('from', {
+            describe:
+              'The starting git reference (commit, branch, or tag). If not provided, auto-detects from merge base with default branch.',
+            type: 'string',
+          })
+          .option('to', {
+            describe: 'The ending git reference (commit, branch, or tag).',
+            type: 'string',
+            default: 'HEAD',
+          })
+          .option('default-branch', {
+            alias: 'b',
+            describe:
+              'The name of the default branch to compare against when auto-detecting.',
+            default: 'main',
+            type: 'string',
+          })
+          .option('fix', {
+            describe:
+              'Automatically update changelogs with missing dependency bump entries.',
+            type: 'boolean',
+            default: false,
+          })
+          .option('pr', {
+            describe:
+              'PR number to use in changelog entries (uses placeholder if not provided).',
+            type: 'string',
+          }),
     )
-    .option('project-directory', {
-      alias: 'd',
-      describe: 'The directory that holds your project.',
-      default: '.',
-    })
-    .option('temp-directory', {
-      describe:
-        'The directory that is used to hold temporary files, such as the release spec template.',
-      type: 'string',
-    })
-    .option('reset', {
-      describe:
-        'Removes any cached files from a previous run that may have been created.',
-      type: 'boolean',
-      default: false,
-    })
-    .option('backport', {
-      describe:
-        'Instructs the tool to bump the second part of the version rather than the first for a backport release.',
-      type: 'boolean',
-      default: false,
-    })
-    .option('default-branch', {
-      alias: 'b',
-      describe: 'The name of the default branch in the repository.',
-      default: 'main',
-      type: 'string',
-    })
-    .option('interactive', {
-      alias: 'i',
-      describe:
-        'Start an interactive web UI for selecting package versions to release',
-      type: 'boolean',
-      default: false,
-    })
-    .option('port', {
-      describe:
-        'Port to run the interactive web UI server (only used with --interactive)',
-      type: 'number',
-      default: 3000,
-    })
     .help()
     .strict()
+    .demandCommand(0, 1)
     .parse();
+
+  const command = args._[0] || 'release';
+
+  if (command === 'check-deps') {
+    return {
+      ...args,
+      command: 'check-deps',
+      fromRef: args.from,
+      toRef: args.to,
+      defaultBranch: args.defaultBranch,
+      fix: args.fix,
+      pr: args.pr,
+    } as CheckDepsCommandArguments;
+  }
+
+  return {
+    ...args,
+    command: 'release',
+    projectDirectory: args.projectDirectory,
+    tempDirectory: args.tempDirectory,
+    reset: args.reset,
+    backport: args.backport,
+    defaultBranch: args.defaultBranch,
+    interactive: args.interactive,
+    port: args.port,
+  } as ReleaseCommandArguments;
 }