Add markdown wiki with 473 pages and zk browser

Generate interlinked wiki from master inventory: 397 tool pages,
15 workflow pages, 27 recipe pages, 33 category pages, plus index.
All pages use [[wiki-links]] for cross-navigation between tools,
workflows, recipes, and categories (1782 links total).

Install zk for interactive browsing with fzf search, tag filtering,
and backlink discovery. Add 'fhelp wiki' command and Makefile target.

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

data/generated/wiki/tools/gunzip.md

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+# gunzip
+> Decompress gzip-compressed data (often used in multi-stage payload extraction)
+
+**Category:** [[categories/utilities|utilities]] | **Tier:** Rich (FOR610)
+
+## Usage
+```bash
+gunzip -c compressed.gz > output.bin
+```
+
+## Recipes
+- [[recipes/multi-stage-base64-gzip|Decode Base64 + Gzip Payload]]
+- [[recipes/office-full-decode-chain|Full Office Macro Decode Chain]]
+
+## Workflows
+- [[workflows/document-analysis-workflow|Malicious Document Analysis]] — Step 5: Payload Decoding
+
+## Related Tools
+- [[tools/hexdump|hexdump]] — Display file content in hexadecimal format
+- [[tools/jq|jq]] — Command-line JSON processor for extracting and transforming 
+- [[tools/wget|wget]] — Download files from HTTP/HTTPS/FTP servers
+- [[tools/xxd|xxd]] — Create hex dump of a file or reverse a hex dump back to bina
+
+## FOR610
+**Labs:** 3.4
+**Sections:** 3
+
+#compression #extraction