fix: resolve 11 test failures, clean up stale files, add NVMe build cache

Test Fixes:
- Fixed grep regex matching `test:iso)` instead of `iso|iso:demo)` by
  using `grep -F` for literal string matching in 3 test files
- Increased grep context from -A 5 to -A 15 for FDE reference tests
  since FDE mention is 9+ lines into the iso command block

Stale Files:
- Deleted test-iso.sh (merged into run.sh in Session 4)
- Deleted verify.sh (orphaned, never referenced anywhere)

Documentation:
- Fixed stale test file references in COMPLIANCE.md
- Updated TEST-COVERAGE.md to remove "delegates to test-iso.sh"
- Added JOURNAL.md entry with full audit findings
- Updated STATUS.md timestamp

NVMe Build Cache (from previous session, was uncommitted):
- Added Docker volume `knel-football-cache` for build caching
- Added `clean:cache` and `cache` commands to run.sh
- Cache preserves bootstrap + package downloads between builds

Test Results: 786 pass, 0 fail, 16 VM skip

💘 Generated with Crush

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

STATUS.md

@@ -1,6 +1,6 @@
 # KNEL-Football Project Status Report
 
-> **Last Updated**: 2026-05-01 11:20 CDT
+> **Last Updated**: 2026-05-07 (Session 7 - Full Audit)
 > **Maintained By**: AI Agent (Crush)
 > **Purpose**: Quick-glance status for project manager