Specimen 1 - the page at width. The tree (the seat's whole index, the project row with its name and path above it, 16px per-type glyphs from the material icon theme with the folder tints, filter behind a hairline, a pill per file carrying its comment count; a folder holding a file starts folded, a folder holding only folders starts open, and crates/ and docs/ show that skeleton while client/ sits folded; the reader's own path is open because the rail's jump opened the folders above it), the reader (read-only, shiki-coloured, wrapped, the target line tinted with its gutter +, a thread drawn under its own line and the composer under the line being written), and the comments rail (every dropped thread by path and line, the finish stack at its bottom: the summary box over the door). The reader's own lane scrolls; nothing scrolls sideways.
Specimen 2 - the kinds. One policy decides every file, the same the chat's Read rows read: a Justfile opens coloured with its own grammar and named in the head; a text file no grammar names draws plain, and the head says why; a picture draws itself, bounded, with its mime and dimensions; a PDF draws its pages; and a file with no viewer draws a notice naming its type and size, saying it is still in the tree.
Six tasks, 45h worked against 59h estimated, 0 reopened, 0 failed.
The engine was the easy half; the lifecycle was the cut.
Specimen 3 - the states. A refused read owns its sentence where the file would sit; a tree with no files, and a filter with no match, say so in the tree's own place; a thread the landing could not place parks in the rail with its captured lines kept, never dropped.
Specimen 4 - the narrow page. The reader is the page; the tree and the comments are sheets behind two real buttons, each raising a history entry so the hardware Back closes what it opened, with done and Escape as the other doors. The strip's files slip (the door onto this page) is drawn on the session page's own drawing.
Specimen 6 - the conversation. The same rounds the review page draws of a branch, over the seat's tree scope (one component, both pages): newest first, each round with its age, tally chips and the threads it sealed - and the reply box under the thread being answered. Parked threads sit above in their own group with their captured lines. It takes the whole row; the rail, with the finish, is the Files tab's.
The round's own summary sentence, as the finish took it.