docs: sync READMEs with the v0.4.0 architecture

[aguilar1x]

Summary

Syncs all four READMEs with the v0.4.0 architecture (single-tenant vaults + factory + open issuance). No code changes — docs only.

contracts/vc-vault/README.md — full rewrite

The old README described the defunct multi-tenant model. Updated to the current ABI:

• Removed create_vault, create_sponsored_vault, authorize_issuer(s), revoke_issuer, issue_linked/get_vc_parent, the fee tiers (fee_admin/fee_standard/fee_early), fee_override, sponsors, and the ContractUpgraded event.
• Documented the real API: single-tenant (no owner params), deny_issuer/allow_issuer, set_vault_did, push/receive_push, the 4-arg constructor, immutable contract (no upgrade), fees quoted by the factory.
• Refreshed error codes (added 24/25/26, marked 2/3/20 deprecated), events, storage layout, and the template deploy model.

README.md (root)

• Added the missing vc-vault-factory section.
• Rewrote the vc-vault section (dropped "fee collection in USDC" and the stale function list).
• Updated the testnet deployments table (new addresses + versions).
• Fixed deploy examples for the template/factory model.
• Corrected test counts (127/56 → 61 / 27 / 58, 146 total).

contracts/vc-vault-factory/README.md

• Added the fee ABI (set_fee_*, quote_fee, set_min_fee) and admin ABI (nominate_admin/accept_admin/get_admin).
• Completed the events table (10 events) and added the error-codes table (1–7).

contracts/did-stellar-registry/README.md

• Added error 21 DuplicateServiceId.
• Corrected the id_suffix format to ^[a-z0-9][a-z0-9-]*[a-z0-9]$ (no leading/trailing hyphen) in both places.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 700b504d-502a-426c-adaa-f94b2625aabf

📥 Commits

Reviewing files that changed from the base of the PR and between 7be51bb and b4c62de.

📒 Files selected for processing (4)

• README.md
• contracts/did-stellar-registry/README.md
• contracts/vc-vault-factory/README.md
• contracts/vc-vault/README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/sync-readmes

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