Merge all open README PRs: add 11 new projects and update episode count

[devin-ai-integration]

Summary

This PR consolidates all 11 open README PRs into a single commit:

• Episode count update: Changed from 269 to 303 transcripts (from PR Update episode count from 269 to 303 #47)
• 11 new projects added to the "Projects Built with These Transcripts" section:
  • PM Philosophy Recommendations (PR Add "PM Philosophy Recommendations" Project #50)
  • Advanced Product Management Skills for AI Agents (PR Update README.md for including wdavidturner/product-skills #37)
  • KOHO's LennyAgent (PR Update README.md with KOHO's LennyAgent project #38)
  • PM Roast (PR add pmroast.com to readme #39)
  • Lenny RAG MCP (PR Add Lenny RAG MCP to projects list #40)
  • Talk to Lenny (PR Add Talk to Lenny to projects list #42)
  • Invisible Threads (PR Add 'Invisible Threads' to the project list #44)
  • Counter Narrative Generator (PR Add Counter Narrative Generator to projects list #45)
  • Inspiration (PR Add Inspiration to projects list #48)
  • Lenny's Council (PR Add Lenny's Council to the resources list #51)

Original PRs to close after merging: #37, #38, #39, #40, #42, #44, #45, #47, #48, #50, #51

Review & Testing Checklist for Human

• Verify the episode count (303) is accurate by checking the actual number of transcripts in the episodes/ directory
• Spot-check a few of the project links to ensure they're working
• Note: There's a minor formatting issue - missing space after **[Lenny's Friends in Notion](...)**by on line 140

Notes

Requested by Claire Vo (@cvolawless)

Link to Devin run: https://app.devin.ai/sessions/d0b67d67d38040dd9e0c7853aad89603

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