Module fragments 

The texts rk devshell add serves: three flake fragments, the .envrc line, and the seed pair for a target that has neither file.

Every text is an authored file under blocks/, per distribution:a-human-faced-artifact-is-authored-text; each carries an RK_DEVSHELL_PIN token rendered with a plain replace, never a format, so the ${system} interpolation survives untouched. The fragments describe where they go in a form a coding agent can apply with no parser: a closed placement vocabulary, a literal anchor substring, and a three-state present from the lexical observation.

Structs

Anchor

Where a fragment goes.

Fragment

One fragment: what to add, where, and whether it is already there.

Functions

envrc_line

The one .envrc line, without its newline.

fragments

The four fragments, in application order, judged against the target.

pinned_url

The pinned flake-input URL for a tag: the grammar’s prefix and the tag.

seed_envrc

The whole seed .envrc.

seed_flake

The whole seed flake, pinned at tag.