Add readOnlyHint and openWorldHint annotations to all MCP tools

This fixes ChatGPT's "MCP write action is temporarily disabled" error by explicitly marking all tools as read-only operations. ChatGPT's Developer Mode was misinterpreting the tools as write actions without these annotations.

Changes:
- Added annotations to all 5 tools in both index.js and server-http.js
- All tools now have: annotations: { readOnlyHint: true, openWorldHint: true }
- Added test-annotations.js to verify annotations are correctly returned

Tools updated:
- search_episodes
- get_episode
- search_transcripts
- get_host_info
- get_series_info

🤖 Generated with Claude Code

server-http.js

@@ -402,6 +402,10 @@ All content is contributed by the community, for the community.`,
         {
           name: 'search_episodes',
           description: 'Search HPR episodes by keywords in title, summary, tags, or host notes. Can filter by host, series, tags, and date range.',
+          annotations: {
+            readOnlyHint: true,
+            openWorldHint: true
+          },
           inputSchema: {
             type: 'object',
             properties: {
@@ -440,6 +444,10 @@ All content is contributed by the community, for the community.`,
         {
           name: 'get_episode',
           description: 'Get detailed information about a specific HPR episode including transcript if available',
+          annotations: {
+            readOnlyHint: true,
+            openWorldHint: true
+          },
           inputSchema: {
             type: 'object',
             properties: {
@@ -462,6 +470,10 @@ All content is contributed by the community, for the community.`,
         {
           name: 'search_transcripts',
           description: 'Search through episode transcripts using phrases or multiple terms with AND/OR matching and optional host filters',
+          annotations: {
+            readOnlyHint: true,
+            openWorldHint: true
+          },
           inputSchema: {
             type: 'object',
             properties: {
@@ -514,6 +526,10 @@ All content is contributed by the community, for the community.`,
         {
           name: 'get_host_info',
           description: 'Get information about an HPR host including all their episodes',
+          annotations: {
+            readOnlyHint: true,
+            openWorldHint: true
+          },
           inputSchema: {
             type: 'object',
             properties: {
@@ -536,6 +552,10 @@ All content is contributed by the community, for the community.`,
         {
           name: 'get_series_info',
           description: 'Get information about an HPR series including all episodes in the series',
+          annotations: {
+            readOnlyHint: true,
+            openWorldHint: true
+          },
           inputSchema: {
             type: 'object',
             properties: {