support all flake outputs

[dlipicar]

Only the default output could be built before. Now we support stuff like ws build logos-basecamp#bin-bundle-dir

[Copilot]

Pull request overview

This PR extends the workspace build flow to allow targeting non-default flake package outputs per repo (e.g., ws build logos-basecamp#portable) by exposing repo outputs through the workspace flake and teaching ws build to reference them.

Changes:

• Update ws build to accept repo#output and translate it into the workspace flake attribute naming scheme.
• Update flake.nix to forward all per-repo packages.<system> outputs into the workspace flake as repo (default) and repo--output (non-default).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/ws	Parses repo#output and builds the corresponding WORKSPACE_ROOT#<input>--<output> reference.
flake.nix	Exposes all sub-repo package outputs under workspace packages to make non-default outputs buildable.

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