feat: make incremental indexing configurable via CLI and workflow

Added full control over incremental indexing behavior:

**CLI Changes:**
- Added `--incremental` flag (default: true)
- Added `--full` flag to disable incremental mode
- Updated interactive prompt to ask about incremental mode

**Function Changes:**
- Updated buildIndex(force, mode, incremental) signature
- Added incremental parameter with default value true
- Conditional logic: if incremental=true, skip unchanged repos; else re-index all
- Added console logging to show incremental mode status

**Workflow Changes:**
- Added `incremental` input (boolean, default: true)
- Passes incremental setting to buildIndex via environment variable
- Defaults to true for scheduled (cron) runs

**Usage Examples:**
```bash
# CLI - incremental mode (default)
./awesome index

# CLI - force full re-index
./awesome index --full

# CLI - explicit incremental
./awesome index --incremental

# Workflow - incremental (default)
gh workflow run build-database.yml

# Workflow - full re-index
gh workflow run build-database.yml -f incremental=false
```

This makes incremental indexing opt-out instead of hardcoded, giving users full control over indexing behavior.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lib/indexer.js

@@ -89,7 +89,7 @@ function isAwesomeList(url, name, description) {
 }
 
 // Build the complete index
-async function buildIndex(force = false, mode = null) {
+async function buildIndex(force = false, mode = null, incremental = true) {
   console.clear();
   console.log(purpleGold('\n🚀 AWESOME INDEX BUILDER 🚀\n'));
 
@@ -146,6 +146,7 @@ async function buildIndex(force = false, mode = null) {
   console.log(chalk.green(`✓ Found ${awesomeLists.length} awesome lists!\n`));
 
   let indexChoice = mode;
+  let incrementalChoice = incremental;
 
   // Ask user what to index (only if interactive)
   if (!isNonInteractive) {
@@ -161,9 +162,19 @@ async function buildIndex(force = false, mode = null) {
           { name: '🔍 Select specific categories', value: 'select' },
           { name: '← Back', value: 'cancel' }
         ]
+      },
+      {
+        type: 'confirm',
+        name: 'incremental',
+        message: 'Use incremental mode? (only update changed repos, faster)',
+        default: true,
+        when: (answers) => answers.indexChoice === 'full' || answers.indexChoice === 'sample'
       }
     ]);
     indexChoice = result.indexChoice;
+    if (result.incremental !== undefined) {
+      incrementalChoice = result.incremental;
+    }
   }
 
   if (indexChoice === 'cancel') return;
@@ -171,7 +182,12 @@ async function buildIndex(force = false, mode = null) {
   // Default to 'full' if no mode specified
   if (!indexChoice) indexChoice = 'full';
 
-  console.log(chalk.cyan(`Index mode: ${indexChoice}\n`));
+  console.log(chalk.cyan(`Index mode: ${indexChoice}`));
+  if (indexChoice === 'full' || indexChoice === 'sample') {
+    console.log(chalk.cyan(`Incremental: ${incrementalChoice ? 'Yes (skip unchanged repos)' : 'No (re-index all)'}\n`));
+  } else {
+    console.log('');
+  }
 
   let listsToIndex = awesomeLists;
 
@@ -274,14 +290,20 @@ async function buildIndex(force = false, mode = null) {
             // Determine if we need to fetch README
             let shouldFetchReadme = false;
             if (indexChoice === 'full' || indexChoice === 'sample') {
-              if (!existingRepo) {
-                // New repo - fetch README
-                shouldFetchReadme = true;
-              } else if (existingRepo.last_commit !== repoInfo.pushedAt) {
-                // Repo updated since last index - fetch README
+              if (incrementalChoice) {
+                // Incremental mode: only fetch if new or changed
+                if (!existingRepo) {
+                  // New repo - fetch README
+                  shouldFetchReadme = true;
+                } else if (existingRepo.last_commit !== repoInfo.pushedAt) {
+                  // Repo updated since last index - fetch README
+                  shouldFetchReadme = true;
+                }
+                // else: repo unchanged, skip README fetch
+              } else {
+                // Full re-index mode: always fetch README
                 shouldFetchReadme = true;
               }
-              // else: repo unchanged, skip README fetch
             }
 
             if (shouldFetchReadme) {