Initial skeleton: README, CVE inventory, roadmap, ARCH, ethics + copy_fail_family module absorbed from DIRTYFAIL

modules/_stubs/fragnesia_TBD/MODULE.md

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+# Fragnesia — CVE pending
+
+> ⚪ **PLANNED** stub. See [`../../ROADMAP.md`](../../ROADMAP.md)
+> Phase 7+.
+
+## Summary
+
+ESP shared-frag in-place encrypt path can be coerced into writing
+into the page cache of an unrelated file. Same primitive shape as
+Dirty Frag, different reach.
+
+## Status
+
+Audit-stage. See
+`security-research/findings/audit_leak_write_modprobe_backups_2026-05-16.md`
+section on backup primitives. Notably: trigger appears to require
+CAP_NET_ADMIN inside a userns netns. On kCTF (shared net_ns) that's
+cap-dead, but on host systems where user_ns clone is enabled it's
+reachable.
+
+## Decision needed before implementing
+
+Is the unprivileged-userns-netns scenario in scope for IAMROOT? If
+yes, this module ships. If we restrict to "default Linux user
+account, no namespace tricks," this module is out of scope.
+
+## Not started.