fix(constructs): resolve the review's open questions from Noor's answers

fix(constructs): correct the review pass after a validity review

docs: MIT-only license, keep planning docs out of a public repo

fix(models): drop the PsyEmbedding pooling workaround, re-pin to fixed repos

feat: LLM-generated construct items (design note ITEM_GENERATION.md)

docs: backlog notes from PI's 2026-07-31 message

content: PI landing-page copy and open-source disclaimer

feat: update roadmap with detailed backlog items for features, bugs, and chores

feat: Implement multi-construct functionality in CCR analysis

Roadmap: PI-requested chunking and anchor-vector features