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/references/okf-spec.md

@@ -8,11 +8,20 @@ tags:
   - documentation
   - knowledge-bundle
   - specification
-verified: 2026-08-28
+verified: 2026-10-19
 timestamp: 2026-01-15
 ---
 
-> **Note:** Google Cloud published OKF v0.2 at [GoogleCloudPlatform/open-knowledge-format](https://github.com/GoogleCloudPlatform/open-knowledge-format) with additional frontmatter families for provenance, trust, and attestation. This document covers the v0.1 format used by this knowledge bundle.
+> **Note:** Google Cloud published OKF v0.2 at
+> [GoogleCloudPlatform/open-knowledge-format](https://github.com/GoogleCloudPlatform/open-knowledge-format)
+> (SPEC.md, verified 2026-10-19). v0.2 is a minor bump with two deliberate
+> breaking changes: `timestamp` is superseded by `generated: { by, at }`, and the
+> body `# Citations` list is superseded by a `sources` frontmatter family; it adds
+> optional trust/lifecycle fields (`verified: { by, at }`, `status`,
+> `stale_after`) and the `Attested Computation` type, and permits `okf_version:`
+> frontmatter in a bundle-root `index.md`. This bundle stays on v0.1 semantics
+> (kb-lint enforces them); the bundle-local `verified:` date stamp and `tags`
+> discipline are producer extensions compatible with both versions.
 
 # Open Knowledge Format (OKF) v0.1