feat(aws): add isolated Floci local profiles

[aryasaatvik]

Summary

• add a typed provider-owned Floci profile for endpoint, region, account, credentials, and constrained lifecycle settings
• preserve standalone local defaults while isolating multiple local provider contexts
• carry the selected profile through RPC session context so sidecar and hot-reload providers use the same isolated identity

Validation

• mise exec bun@1.3.13 -- bun run test test/AWS/Local/FlociServices.test.ts --profile testing (6 passed)
• mise exec bun@1.3.13 -- bun run test test/AWS/Providers.test.ts --profile testing (1 passed)
• bun run format:check
• git diff --check
• pnpm exec tsc -b packages/alchemy/tsconfig.json reaches A1 without diagnostics; the workspace remains blocked by pre-existing missing Cloudflare/framework dependencies

Scope

No live AWS/provider apply or credentials were used. RPC transport changes are limited to the typed session profile needed by AWS local sidecars; no Samva, Floci, Distilled, or integration packaging changes.