docs: reorganize guides into a linked wiki

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JaWS usage guidance was scattered across AI.md files, READMEs, and package comments. Move it into a linked Markdown wiki under doc/, with smaller widget guides. Keep API contracts and implementation rationale beside the code, put generic design decision checklists in the optional JaWS skill, and remove the obsolete security report.

The guides cover standard Go templates, direct application-object methods, dependency tags, trusted attributes and escaped values, and inline initial attributes with later widget updates. The Minesweeper example now dirties large changed sets one tag at a time so flood reveals are not truncated by the tag-expansion limit; a two-client regression covers 200 changed cells. Nonterminal resets update only revealed or flagged cells, and repeated resets send nothing.

Validation:

• JAWS_REQUIRE_NODE=1 go test ./...
• JAWS_REQUIRE_NODE=1 go test -race ./...
• go generate ./..., go build ./..., and go vet ./...
• gofmt -l . and git diff --check
• Local Markdown links and heading anchors checked.
• Extracted initial/later attribute examples tested with race detection, including zero queued initial commands and both directions of later attribute changes.