Initial workspace: scaffold + constitution + spec documents

Rust workspace with 5 crates (mesh-types, mesh-crypto, mesh-network,
mesh-validator, mesh-wallet), PROJECT_CONSTITUTION.md for CHORUS
automated ingestion, and the full MESH protocol specification suite.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.cargo/config.toml

@@ -0,0 +1,19 @@
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"
+rustflags = ["-C", "link-arg=-fuse-ld=mold"]
+
+[build]
+# jobs defaults to number of CPUs
+
+[profile.dev]
+opt-level = 0
+debug = true
+
+[profile.test]
+opt-level = 1  # crypto tests too slow at opt-level 0
+
+[profile.release]
+opt-level = 3
+lto = "thin"
+codegen-units = 1
+strip = true