docs: alpha.8 docs and resource-lifecycle cache example

[mahyarmlk]

Summary

Update public docs for the alpha.8 release and add resource cache phase 1 (staleTime, deduplicate) to the resource-lifecycle example.

Changes

README / Quickstart / Release docs

• Update all alpha version references from 0.1.0-alpha.7 to 0.1.0-alpha.8
• Add Resource cache phase 1 (staleTime, deduplicate) to the capability list in README.md
• Update limitations to note cache is phase 1 with future work remaining

docs/Resources.md

• Already correct for alpha.8 — no changes needed

examples/resource-lifecycle

• Add cachedTeam resource with cache: { staleTime: 50 } demonstrating time-based staleness
• Add dedupeReport resource with cache: { deduplicate: true } demonstrating concurrent load sharing
• Add corresponding actions (Reload cached team, Load dedupe report)
• Add 3 new tests covering staleTime timeout, reload resetting staleTime, and deduplicate promise sharing
• Update README with cache options documentation

Validation

• pnpm test: all 14 resource-lifecycle tests pass (was 11)
• pnpm typecheck: clean
• pnpm build: clean
• pnpm lint: clean
• pnpm changeset status: clean

Docs/example-only PR — merge when green.