v0.10.0 - model-runner + research tooling

What's Changed

• Modal Runner, Training, Sessions, KV Pack/Load + more by @Snider in #6
• fix: migrate module paths to dappco.re by @Snider in #2
• chore(dev→main): routine PR cadence for CodeRabbit review by @Snider in #3
• v0.9.0 compliance: full upgrade against core/go reference by @Snider in #4
• restructure to /go/ subtree (Phase 1, Mantis #1241) by @Snider in #5

Full Changelog: v0.9.0...v0.10.0