After completing Task 3 of initial 3 task punch list.

Codex_Response_4.md

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+Created [SPEC.md](/usr/local/src/reticulum/LXMF/SPEC.md) containing the evidence-limited `LXMessage Wire Format` section.
+
+It documents:
+
+- Core serialized layout and payload order
+- Message ID and signature-input calculations
+- Stamp exclusion behavior
+- Delivery representations
+- Exact source references and evidence commits
+- Explicit unresolved behavior
+
+Verification: `perl tools/verify_examples.pl` passed all checks.
+
+Only `SPEC.md` is untracked; no other files were changed.