Align official packages with event work runtime

[Ryzon3]

Summary

• Aligns official package docs and metadata with Moorline as an operator-controlled event/work orchestration runtime.
• Adds official-package terminology covering external surfaces, external resources, work items, and package jobs.
• Updates persona/session/memory package wording away from local-first, Discord-centered, and Codex-specific assumptions where the package is meant to be provider/session general.
• Adds a contract test that prevents stale package-facing product language from reappearing.

Package Interface Audit

• Existing official package implementations remain compatible with the new host contracts because the host changes are additive.
• No current official package should migrate to package.work.manage yet: missions are scheduled package jobs, and Discord packages remain Discord transport/chat surfaces.
• The packages repo is still building against published @moorline/contracts@0.0.1 and @moorline/package-kit@0.0.1; publishing or otherwise linking the updated host/kit packages is a separate release step before official packages can type-check new onExternalEvent, package.work.manage, or provider.headless.run code.

Notes

• VISION.md is intentionally untouched because repo instructions say not to update it directly.
• This pass updates existing official package surfaces and documents the new package-authoring direction; it does not add a new GitHub/CI/email worker package.

Validation

• bun run check
• git diff --check

[Ryzon3]

Superseded by #4, which includes the full transport-resource contract alignment after the main runtime rename.