v0.15.15

What's Changed

• feat(llm): add provider and gateway runtime contracts by @alemicali in #164
• feat(llm): opt in direct provider model resolution by @alemicali in #165
• refactor(core): own neutral model runtime facts by @alemicali in #166
• feat(drizzle): add model invocation ledger by @alemicali in #167
• chore: release v0.15.13 by @alemicali in #168
• chore: release v0.15.15 by @alemicali in #169

Full Changelog: v0.15.12...v0.15.15