docs: close OKF conformance gaps found by night audit

- references/okf-spec.md: replace v0.2 note with the deltas verified
  against upstream SPEC.md 2026-10-19 (timestamp->generated.at and
  # Citations->sources are the two breaking changes; trust fields and
  root-index okf_version are additive; bundle stays v0.1).
- index.md: restore the agentic-web-research section lost in the
  2026-08-28 rebuild and link log.md (index-coverage doctrine).
- gen-keybinds.sh emits OKF frontmatter so its generated artifact
  (tools/niri/keybindings.md, regenerated, 120 bindings) passes kb-lint;
  test added red->green.
- fix the two broken [[niri]] wikilinks (handy, noctalia-shell).

Refs #29

omp-docs/index.md

@@ -48,7 +48,17 @@ Practice notes: SDLC, languages, infra tooling (Terraform, K8s, containers).
 Decision-support research: agentic web tooling, chezmoi evaluation,
 secrets-for-agents. Research docs inform decisions; they are not facts yet.
 
+## [Agentic web research](agentic-web-research/index.md)
+
+Self-hosted web-agent stack research: SearXNG tuning, VPN routing, agentic
+search practices, open models, MCP.
+
 ## [Inventory](inventory/index.md)
 
 Pre-pruning census of every userspace config on this box — the input for the
 pruning session.
+
+## [Change history](log.md)
+
+Chronological update history of this bundle — incident lessons land here first,
+then settle into concept pages.