Sync Space with HCM-21-Private main (72f5f30): reward recalibration, seeded RNG streams, MCP integration, poster artifacts

Deploy to HF Spaces + add TRL/Unsloth training notebook

Add TAM/growth analysis, hackathon context, and demo talk track

Update README.md

Fix punctuation in README description

Initial release: HCM:21 HR Productivity Measurement Environment