docs: add scope field documentation for blueprint storage

[pyramation]

Summary

Updates skill documentation to reflect the new scope field on top-level blueprint storage[] entries. Only 'app' (default) and 'org' are allowed.

Changes across 4 files:

• blueprint-definition-format.md — rewrites the storage section from a single-object format to an array format with scope field, adds examples for app-scoped, org-scoped, and both-scopes-together
• storage-policies.md — adds org-level row to the membership policy type table and updates the storage levels description
• constructive-features/SKILL.md — adds "Org-scoped storage" row to the Storage & Uploads feature catalog
• constructive-sdk-uploads/SKILL.md — adds scope examples and auto-injection docs to the bucket seeding section

Companion to constructive-db PR #1240 and constructive PR #1195.

Review & Testing Checklist for Human

Low risk — docs only.

• Verify blueprint JSON examples are valid and match the actual construct_blueprint behavior
• Verify the org-level membership policy type row is correct (membership_type=2, AuthzEntityMembership)

Notes

No code changes — documentation only.

Link to Devin session: https://app.devin.ai/sessions/c0494871633d4beb91f1e16e53c776d1
Requested by: @pyramation

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