[claude] Add .gitattributes export-ignore + large-repo clone docs (#1428) (#1433)

.gitattributes

@@ -0,0 +1,48 @@
+# .gitattributes
+# Controls git archive exports and helps categorize repo contents.
+# export-ignore: excluded from `git archive` tarballs and sparse-export contexts.
+#
+# For agents blocked by repo size on clone, see CONTRIBUTING.md §"Large-Repo Clone Strategy".
+
+# ── Documentation & reports (not needed for runtime or tests) ──────────────────
+docs/               export-ignore
+reports/            export-ignore
+audits/             export-ignore
+reviews/            export-ignore
+paper/              export-ignore
+scaffold/           export-ignore
+playground/         export-ignore
+examples/           export-ignore
+intelligence/       export-ignore
+
+# Root-level narrative docs (keep CLAUDE.md, README.md, CONTRIBUTING.md)
+FINDINGS-*.md       export-ignore
+FIRST_LIGHT_REPORT*.md  export-ignore
+INVESTIGATION_*.md  export-ignore
+LEGACY_MATRIX_AUDIT.md  export-ignore
+SOUL.md             export-ignore
+POLICY.md           export-ignore
+BROWSER_CONTRACT.md export-ignore
+EVENNIA_NEXUS_EVENT_PROTOCOL.md  export-ignore
+GAMEPORTAL_PROTOCOL.md  export-ignore
+DEVELOPMENT.md      export-ignore
+
+# ── Operation-specific directories ────────────────────────────────────────────
+operation-get-a-job/  export-ignore
+operations/           export-ignore
+org/                  export-ignore
+concept-packs/        export-ignore
+evolution/            export-ignore
+
+# ── Assets (binary/media files not needed for CI) ─────────────────────────────
+assets/             export-ignore
+icons/              export-ignore
+
+# ── Linguist overrides (GitHub/Gitea language stats) ──────────────────────────
+docs/               linguist-documentation
+scaffold/           linguist-documentation
+paper/              linguist-documentation
+reports/            linguist-documentation
+audits/             linguist-documentation
+
+*.md                linguist-documentation