feat(cmd): add analyze command for project analysis

Introduces a new Cobra command `analyze` that performs deep project analysis,
discovers files, builds context, streams to Grok for report generation, and
handles output with confirmation.

cmd/analyze.go

@@ -0,0 +1,19 @@
+var analyzeCmd = &cobra.Command{
+    Use:   "analyze [flags]",
+    Short: "Deep project analysis → educational Markdown report",
+    Run: func(cmd *cobra.Command, args []string) {
+        dir := viper.GetString("dir") // or flag
+        output := viper.GetString("output")
+
+        // 1. Discover files via internal/linter
+        files, err := linter.DiscoverFiles(dir)
+        // 2. Build context (tree, git remote, go.mod, etc.)
+        context := buildProjectContext(dir, files)
+        // 3. Send to Grok (silent stream)
+        report := grokClient.StreamSilent(buildAnalyzePrompt(context), model)
+        // 4. Clean + preview (unified diff style against existing analyze.md if present)
+        // 5. Confirm unless --yes
+        // 6. Write or print
+    },
+}
+