docs: FreeEed Forensics Edition user guide and attribution records

[Copilot]

Tracks the first complete FreeEed Forensics Edition ISO (build 20260722, ~58 GB, MX Linux base, contributor: Remco Siderius). Adds the user-facing documentation and license/attribution records called for in the release checklist.

New: docs/forensics-edition-guide.md

• Boot instructions, USB write command, checksum verification (md5sum, expected 82bf413fc2b2d27539c5e5d1eda64974)
• Full installed tool inventory across 11 categories (eDiscovery, disk forensics, email, network, data analysis, mobile, passwords, hashing, AV, malware, local AI/Ollama)
• System requirements, versioning scheme, download table, licensing overview, and known gaps (Timesketch integration, reproducible build script, per-ISO manifest)

New: docs/forensics-edition-attributions.md

• Per-tool attribution table: author/maintainer, license (SPDX), upstream URL for every bundled tool
• Special attribution for benfordcheck v0.2 (© 2009 Folkert van Heusden, no longer on GitHub — credited via vanheusden.com)
• Redistribution notes: GPL source-availability obligations satisfied by upstream links; flags FTK Imager (Exterro proprietary freeware) and Maltego Community as requiring individual EULA review before public ISO distribution; covers LLM weight licenses

Updated: docs/decisions/forensics-iso-edition.md

• Added "User-facing documentation" section linking the two new files
• Expanded open items: per-ISO MANIFEST.txt, hosting decision, benfordcheck redistribution clarification, FTK Imager/Maltego license confirmation gate before public release

• Fixes FreeEed Forensics Edition — review, QA, and path to release (ISO build v20260722) #591