docs: karpathy-pattern wiki built from the spec, plan, design contract and decisions ledger

kb/ is its own wiki root: 34 pages across 7 categories, index.md catalog, log.md, AGENTS.md schema layer, and raw/ holding copies of README, the spec, the 13-task plan, the design master and the SDD ledger.

Every page cross-references 3 to 6 others and all 107 wikilinks resolve except two [["list"]] artefacts inside JSON snippets in the copied plan.

Kept separate from the repository root on purpose: its generated graph lands in kb/.ua/ instead of overwriting the code graph.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

kb/AGENTS.md

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+# Wiki conventions (schema layer)
+
+This directory is a Karpathy-pattern wiki: raw sources, wiki pages, and this schema file.
+
+## Layout
+- `raw/` — immutable sources copied from the repository. Never edited here.
+- `index.md` — the catalog, grouped by category. Every page appears exactly once.
+- `log.md` — chronological record of what was added, and why.
+- `<Page Name>.md` — one page per concept. File name is the link target.
+
+## Categories
+- Pipeline
+- Data and storage
+- Security and credentials
+- Interface
+- Verification
+- Operations
+- Decisions
+
+## Page rules
+1. Start with `# <Page Name>`, then 120 to 250 words of prose.
+2. Cross-reference with `[[Page Name]]`. Every page links 3 to 6 others, and every link must resolve.
+3. State measured facts (numbers, timings, error strings) instead of adjectives. Note the measurement when it
+   came from a specific artifact.
+4. A page about a decision says: what the old behaviour was, what it cost, what replaced it, what it broke.
+5. No code blocks longer than 5 lines. Long code belongs in `raw/`.