fix: Add interactive parameter to prevent stdin read during tests

Fixes 2 failing tests in test_architecture_scenarios.py that were trying to
read from stdin during pytest execution, causing:
  OSError: pytest: reading from stdin while output is captured!

Changes:
- Added 'interactive' parameter to UnifiedCodebaseAnalyzer.analyze() (defaults to True)
- Pass interactive flag through to _analyze_github() and GitHubThreeStreamFetcher
- Updated failing tests to pass interactive=False

Tests fixed:
- test_scenario_1_github_three_stream_fetcher
- test_scenario_1_unified_analyzer_github

The interactive parameter controls whether the code prompts the user for
input (e.g., 'Continue without token?'). Setting it to False prevents
input() calls, making the code safe for CI/CD and test environments.

All 1386 tests now pass.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/skill_seekers/cli/unified_codebase_analyzer.py

@@ -74,6 +74,7 @@ class UnifiedCodebaseAnalyzer:
         depth: str = "c3x",
         fetch_github_metadata: bool = True,
         output_dir: Path | None = None,
+        interactive: bool = True,
     ) -> AnalysisResult:
         """
         Analyze codebase with specified depth.
@@ -83,6 +84,7 @@ class UnifiedCodebaseAnalyzer:
             depth: 'basic' or 'c3x'
             fetch_github_metadata: Whether to fetch GitHub insights (only for GitHub sources)
             output_dir: Directory for temporary files (GitHub clones)
+            interactive: Whether to show interactive prompts (False for CI/CD and tests)
 
         Returns:
             AnalysisResult with all available streams
@@ -93,13 +95,13 @@ class UnifiedCodebaseAnalyzer:
         # Step 1: Acquire source
         if self.is_github_url(source):
             print("📦 Source type: GitHub repository")
-            return self._analyze_github(source, depth, fetch_github_metadata, output_dir)
+            return self._analyze_github(source, depth, fetch_github_metadata, output_dir, interactive)
         else:
             print("📁 Source type: Local directory")
             return self._analyze_local(source, depth)
 
     def _analyze_github(
-        self, repo_url: str, depth: str, fetch_metadata: bool, output_dir: Path | None
+        self, repo_url: str, depth: str, fetch_metadata: bool, output_dir: Path | None, interactive: bool = True
     ) -> AnalysisResult:
         """
         Analyze GitHub repository with three-stream fetcher.
@@ -109,12 +111,13 @@ class UnifiedCodebaseAnalyzer:
             depth: Analysis depth mode
             fetch_metadata: Whether to fetch GitHub metadata
             output_dir: Output directory for clone
+            interactive: Whether to show interactive prompts (False for CI/CD and tests)
 
         Returns:
             AnalysisResult with all 3 streams
         """
         # Use three-stream fetcher
-        fetcher = GitHubThreeStreamFetcher(repo_url, self.github_token)
+        fetcher = GitHubThreeStreamFetcher(repo_url, self.github_token, interactive=interactive)
         three_streams = fetcher.fetch(output_dir)
 
         # Analyze code with specified depth