✨ feat: Bring base image up to NixOS 26.05

[jpmcb]

Upgrades base image to NixOS 26.05: https://nixos.org/blog/announcements/2026/nixos-2605/

[greptile-apps]

Greptile Summary

This PR bumps the base NixOS image from nixos-25.11 to nixos-26.05, updating flake.nix, the lock file, and the README documentation table to match.

• flake.nix: Single-line URL change; agentd, stereosd, and dagger all continue to follow the root nixpkgs, so the version is propagated consistently.
• flake.lock: All direct and transitive pins are refreshed; flake-parts now has a proper locked/original section it was previously missing (floating), and three new transitive entries — skills, flake-skills, and nixpkgs_2 — appear because the updated stereosd revision added a skills dependency.

Confidence Score: 5/5

Straightforward NixOS channel bump; all direct inputs follow the updated root nixpkgs and the lock file is fully pinned.

The change is a mechanical version upgrade — one URL in flake.nix, matching lock-file refreshes, and a documentation update. All existing follows overrides remain intact, the previously floating flake-parts entry is now properly locked, and the new transitive deps (skills, flake-skills) are pinned. No logic, modules, or configuration is altered.

No files require special attention.

Important Files Changed

Filename	Overview
flake.nix	Single-line change updating nixpkgs input URL from nixos-25.11 to nixos-26.05; stereosd and agentd continue to follow the root nixpkgs correctly
flake.lock	Bumps agentd, stereosd, dagger, nixpkgs, nixpkgs-lib, and nixpkgs-unstable; fixes a pre-existing gap where flake-parts had no locked/original section (it was floating); adds expected new transitive entries (skills, flake-skills, nixpkgs_2) pulled in by updated stereosd
README.md	Updates the external dependencies table to reflect nixos-26.05 — documentation kept in sync with flake.nix

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    root["stereos (root flake)"]
    nixpkgs["nixpkgs\nnixos-26.05"]
    nixpkgs_unstable["nixpkgs-unstable\nnixpkgs-unstable"]
    flake_parts["flake-parts\nhercules-ci/flake-parts"]
    agentd["agentd\npapercomputeco/agentd"]
    stereosd["stereosd\npapercomputeco/stereosd"]
    dagger["dagger\ndagger/nix"]
    skills["skills\npapercomputeco/skills (transitive)"]
    flake_skills["flake-skills\npapercomputeco/flake-skills (transitive)"]
    nixpkgs2["nixpkgs_2\nnixos-unstable (transitive)"]

    root --> nixpkgs
    root --> nixpkgs_unstable
    root --> flake_parts
    root --> agentd
    root --> stereosd
    root --> dagger

    agentd -->|follows| nixpkgs
    stereosd -->|follows| nixpkgs
    dagger -->|follows| nixpkgs

    stereosd --> skills
    skills --> flake_skills
    flake_skills --> nixpkgs2

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