chore: standardise, Justfile, (rename,, fix, parse, errors,, remove, useless, commands)

Batch Justfile audit: standardised naming (lowercase→Justfile),
fixed parse errors, removed useless build-riscv from non-Rust repos,
added missing assail recipe, and fixed code quality issues.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

justfile Justfilejustfile renamed to Justfile

@@ -159,11 +159,6 @@ full-build: check-proofs build icons lint-ext security-scan build-ext
     @echo "✓ Full build complete"
     @ls -lh extension/web-ext-artifacts/
 
-# [AUTO-GENERATED] Multi-arch / RISC-V target
-build-riscv:
-	@echo "Building for RISC-V..."
-	cross build --target riscv64gc-unknown-linux-gnu
-
 # Run panic-attacker pre-commit scan
 assail:
     @command -v panic-attack >/dev/null 2>&1 && panic-attack assail . || echo "panic-attack not found — install from https://github.com/hyperpolymath/panic-attacker"