Add c2 wiki origins research (Ward Cunningham, terms, use cases)

Explores WikiWikiWeb beginnings: design principles, social conventions,
navigation vocabulary, and documented use cases. Federation explicitly
deferred to a later research track.

research/260608-c2-wiki-origins/README.md

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+# 260608 — c2 wiki origins (Ward Cunningham)
+
+Date: 2026-06-08
+
+## What this is
+
+Research into the beginnings of the wiki movement through Ward Cunningham,
+the Portland Pattern Repository, and the original **WikiWikiWeb** at c2.com.
+
+Focus: popular terms, social conventions, and documented use cases from and
+about the c2 wiki. **Federation is explicitly out of scope** for this
+exploration (separate research planned).
+
+## Contents
+
+| Path | Role |
+|------|------|
+| `findings.md` | Terms glossary, use-case catalog, design principles, sources |
+
+## Status
+
+Initial exploration complete. Findings may inform `spec/` and future
+workplans; not yet promoted to specification.