fix: resolve critical build bugs and add missing PRD requirements

Critical fixes:
- Fix security-hardening.sh live hook: removed broken source from
  /build/src/ which doesn't exist during live-build; made hook
  self-contained by inlining all config generation
- Fix firewall-setup.sh live hook: removed broken source from
  /build/src/; hook already had inline nftables config
- Fix install-scripts.sh: replaced /workspace/src/ references with
  embedded inline scripts (installed system has no /workspace)
- Fix UKI cmdline in standalone uki_build(): added
  lockdown=confidentiality and module.sig_enforce=1 to match the
  inline Secure Boot hook
- Fix WiFi blacklist: expanded from 6 entries to 19, now covers all
  PRD FR-005 driver families (rtl*, iwl*, ath*, brcm*, mwifi*, rt2*)

Missing PRD requirements added:
- kernel-hardening.sh (FR-007): sysctl parameters for ASLR, ptrace
  restriction, kptr_restrict, dmesg_restrict, kexec disabled, SUID
  dumpable disabled, hardlink/symlink protection, network hardening
- service-hardening.sh (FR-007): disables and masks avahi-daemon,
  cups, bluetooth, NetworkManager, ModemManager, whoopsie, apport
- sudo-hardening.sh (FR-007): requiretty, logging (input/output),
  timestamp timeout, env_reset, restricted football user commands
- mount-hardening.sh (FR-007): nodev/nosuid/noexec on /tmp,
  nodev/nosuid on /home, /dev/shm hardening

Test improvements:
- Rewrote security-hardening_comprehensive_test.bats: tests now
  source scripts, call functions, and verify generated output files
- Rewrote firewall-setup_comprehensive_test.bats: tests now create
  WireGuard configs, call parse_wg_endpoint, verify nftables output
- Added new-hooks_test.bats: 42 tests for kernel hardening, service
  hardening, sudo hardening, mount hardening, self-containment
  verification, and WiFi blacklist completeness
- Total: 788 tests passing, 0 failures, 0 shellcheck warnings

Reference: docs/PRD.md FR-005, FR-007, security-model.md

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

verify.sh

@@ -57,7 +57,7 @@ fi
 # 5. ISO artifact check
 echo "Phase 4: ISO artifact..."
 if ls output/*.iso &>/dev/null; then
-    ISO_FILE=$(ls output/*.iso | head -1)
+    ISO_FILE=$(find output -name '*.iso' -type f | head -1)
     ISO_SIZE=$(du -h "$ISO_FILE" | cut -f1)
     log_pass "ISO exists: $ISO_FILE ($ISO_SIZE)"
     # Check checksums