docs(profile): clarify role taxonomy

[ArchonVII]

Summary

• Clarifies ArchonVII role names as authority roles, executable command/agent names, PR marker/configuration signals, or future automation.
• Documents the github-workflows marker behavior for Project-Lieutenant, LIEUTENANT_HANDOFF, and Release-Admiral: @name.
• Cross-links adjacent role-policy and setup work without duplicating their implementation scope.

Verification

• git diff --check
• No repo test/check command available; docs-only repo has no package.json, Makefile, taskfile, Python test config, or workflow files.

Verification Notes

git diff --check passed. Git printed its existing line-ending warning for profile/README.md; no whitespace errors were reported.

Docs/Changelog

• Updated profile/README.md.
• Changelog not applicable; this repo has no changelog fragment mechanism and the change is org-profile documentation only.

Linked Issue

Closes #21

Related:

• F11: Release-Admiral 'finish it' merge contract (7-step runbook) #16
• F19: Issue-Admiral triage role + ISSUE_ADMIRAL_TRIAGE output format #18
• docs(workflow): add release workflow breakdown github-workflows#35
• docs(ecosystem): refresh snapshot status archon-setup#63

Risks

• Low risk: docs-only taxonomy clarification.
• Future workflow or role automation changes may need to update this taxonomy if they introduce actual repo-local commands.