Update organization-adapters.md: the organizations/ structural check has shipped

[justinmclean]

Summary

Rewrite the Known gaps bullet in
tools/spec-loop/specs/organization-adapters.md that says no validator check
enforces required files under organizations/<org>/. The check exists.

Background

The bullet reads "No structural validator check yet enforces required files in
organizations/<org>/ (currently README + organization.md by convention)." That
check shipped in #721 as validate_organization_structure, and it is a HARD
check, so the requirement is no longer convention-only.

Spec Known gaps sections are not just documentation: the spec-loop plan beat
reads them to choose the next work item, so a gap that describes already-shipped
code sends the loop at finished work.

Where to look

• tools/spec-loop/specs/organization-adapters.md line 125 - the bullet to
  rewrite.
• tools/skill-and-tool-validator/src/skill_and_tool_validator/__init__.py -
  validate_organization_structure is called at line 3706.
• organizations/ - the live tree the check runs against. Note that
  _template is deliberately excluded.

Verify by finding the call site, not the definition.

Acceptance criteria

• The bullet describes the shipped check instead of claiming it is missing.
• The description states which files are required, that the check is HARD,
  and that _template is excluded.
• uv run --project tools/spec-validator spec-validate tools/spec-loop/specs/
  passes.

Estimated effort

~30 minutes for someone new to the codebase.

Getting started

New to Magpie? Start with
Your first contribution.

Note: this issue was drafted by an AI-assisted mentoring tool and may contain
mistakes. A Magpie maintainer, a real person, will be the next to engage on it.
If something here looks wrong or unclear, please say so on the issue and a
maintainer will follow up. See
CONTRIBUTING.md
for how Magpie handles contributions.

[Hashim1999164]

I’d like to work on this documentation update. I’ll verify the live validator call site and update the Known gaps bullet to reflect the required files, HARD severity, and _template exclusion.

[Hashim1999164]

I checked the current default branch before editing. organization-adapters.md already documents the shipped call site at lines 119–123, including README.md, organization.md, HARD severity, and the _template exclusion, and the stale Known gaps bullet is no longer present. No additional PR appears necessary, so I’m stepping back.