#637 chore(deps): upgrade clawdbot to v2026.1.20 and add automatic pnpmDepsHash computation

Changes

• Upgraded clawdbot overlay from v2026.1.16-2 to v2026.1.20
• Updated all related hashes (source hash, pnpmDepsHash, app hash)
• Added automatic pnpmDepsHash computation function to upgrade-overlays.sh
• Added pnpm-hash command to update only pnpmDepsHash when needed
• Improved upgrade script to automatically compute correct pnpmDepsHash

Technical Details

• The new compute_pnpm_deps_hash() function runs a build attempt with a fake hash
• Extracts the correct hash from the nix build error output
• Automatically updates overlays/default.nix with the computed hash
• Allows manual hash updates via ./scripts/upgrade-overlays.sh pnpm-hash

Testing

• Manual testing of pnpmDepsHash computation function
• Verified hash extraction from build error output
• Tested new pnpm-hash command

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Summary by cubic

Upgrades the clawdbot overlay to v2026.1.20 and automates pnpmDepsHash updates to prevent manual fixes after Nix build failures.

• Dependencies

  • Updated clawdbot source and app to v2026.1.20 with new hashes.
  • Refreshed flake.lock (nix-clawdbot, nixpkgs, home-manager, etc.).

• New Features

  • Added compute_pnpm_deps_hash() to auto-derive pnpmDepsHash from a build error.
  • Introduced pnpm-hash command to update only pnpmDepsHash.
  • upgrade-overlays.sh now auto-updates pnpmDepsHash during clawdbot upgrades.