Record second-registry verification; do not extract an adapter

[samrusani]

Summary

• Official-docs pass (2026-08-19) on Bolagsverket HVD and SEC EDGAR: neither is a second Companies House, so no Protocol is extracted and no Swedish or EDGAR client is added.
• v0.1 stays UK-only. A later Swedish lookup, if built, is HVD (POST identitetsbeteckning, OAuth after kundanmälan, no officers/UBO/charges). EDGAR is a filings archive for SEC filers, not a register.
• README no longer claims a documented Sweden/US adapter interface. Next HANDOFF item is --no-write.

Test plan

• Docs-only; local language check, ruff, mypy, pytest still 736
• GitHub checks 3.11/3.12/3.13, package, audit

[greptile-apps]

Greptile Summary

This documentation-only PR records why Bolagsverket HVD and SEC EDGAR do not justify extracting a cross-registry adapter yet, keeps v0.1 UK-only, and updates the roadmap accordingly.

• Adds detailed official-documentation research and decisions for Bolagsverket HVD and SEC EDGAR.
• Aligns architecture, future-work, handoff, and README guidance around deferring the adapter abstraction.
• Promotes --no-write mode to the next recommended task.

Confidence Score: 5/5

The PR appears safe to merge; the documentation changes are internally consistent and introduce no actionable defects.

The changes only revise documentation and planning guidance, consistently preserving the UK-only scope while deferring a registry abstraction until a suitable second register exists.

Important Files Changed

Filename	Overview
ARCHITECTURE.md	Clarifies that the non-UK adapter contract remains open because neither researched source matches Companies House.
DECISIONS.md	Records detailed integration constraints and the decision not to add Swedish or EDGAR clients in this sprint.
FUTURE.md	Refines future registry work around the actual capabilities and limitations of HVD and EDGAR.
HANDOFF.md	Documents the completed research and changes the next recommended task to --no-write.
README.md	Aligns public scope, roadmap, and contribution guidance with the decision to defer adapter extraction.

_{Reviews (1): Last reviewed commit: "Record that neither second-registry cand..." | Re-trigger Greptile}