What's Changed

• feat: add task-scoped tool sessions by @heznpc in #357
• feat: require sessions for hidden tool dispatch by @heznpc in #359
• feat: add module pack runtime contract by @heznpc in #360
• chore: clarify module add-on package names by @heznpc in #361
• feat: harden modular runtime controls by @heznpc in #362
• feat: stage add-ons and lazy tool descriptions by @heznpc in #363
• test: verify add-on install and harness gates by @heznpc in #364
• test: harden add-on provenance gates by @heznpc in #365
• test: measure add-on split value by @heznpc in #366
• build: dedupe add-on shared runtime by @heznpc in #367
• feat: add on-demand module add-ons by @heznpc in #368
• feat(addons): harden release add-on UX by @heznpc in #369
• feat(addons): verify registry drift and repair UX by @heznpc in #370
• feat: add modular distribution drills by @heznpc in #371
• [codex] fix external issue regressions by @heznpc in #372
• fix: make release publish resumable by @heznpc in #373

Full Changelog: v2.14.0...v2.15.0