flake.lock: update

Flake lock file updates:

• Updated input 'agents':
    'path:./agents'
  → 'path:./agents'
• Updated input 'bench-filesystem':
    'path:./bench/filesystem'
  → 'path:./bench/filesystem'
• Updated input 'examples':
    'path:./examples'
  → 'path:./examples'
• Updated input 'home-manager':
    'github:nix-community/home-manager/486595d' (2026-06-11)
  → 'github:nix-community/home-manager/5bcff43' (2026-06-18)
• Updated input 'images':
    'path:./images'
  → 'path:./images'
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a799d3e' (2026-06-06)
  → 'github:NixOS/nixpkgs/567a49d' (2026-06-16)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/107c334' (2026-06-11)
  → 'github:oxalica/rust-overlay/c06d86d' (2026-06-18)
• Updated input 'site':
    'path:./site'
  → 'path:./site'
• Updated input 'skills':
    'path:./skills'
  → 'path:./skills'
• Updated input 'snix-src':
    'git+https://git.snix.dev/snix/snix?ref=canon&rev=3251a55da2c9ebdf7392e281d959eb70ed5b6054' (2026-06-11)
  → 'git+https://git.snix.dev/snix/snix?ref=canon&rev=1f86b75dfa1cdd7ddcd19a893a6dc480c9b230e3' (2026-06-17)
• Updated input 'tests':
    'path:./tests'
  → 'path:./tests'

Author: github-actions[bot]