XY-1118: [ELF AMK P6] Add Work Continuity benchmark suite and hard-fail gates

[yvette-carlisle]

Summary

• Add the Work Continuity real-world benchmark suite for Work Journal reset/resume, rationale, rejected options, next steps, handoff refs, redaction, and janitor promotion boundaries.
• Publish Work Continuity report metrics and hard-fail hits for sensitive persistence, rejected-option resurrection, inferred-step instructions, journal-only authority claims, and janitor false promotion.
• Add focused fixtures, regression tests, cargo-make task wiring, and benchmark spec/runbook updates.

Validation

• cargo make fmt
• cargo make lint-fix
• cargo make checks
• cargo make real-world-memory-work-continuity
• cargo make real-world-memory-json

Review

• Independent fresh-context repair verification is clean for HEAD 71df08b.