Contract: one issue page. The studio's tell page serves every repository and takes dev's details #626

Pillar: P1 Feed (umbrella #587). Contract: one of the duplicated screens the studio/dev split left behind. One run, fresh from today's main.

The job: read one issue or tell and act on it.

Survivor: the studio tell page (src/web/studio/tell.ts), made to serve repositories that are not apps too, with dev's controls that matter (labels, assignee, dependencies, close) in one quiet Details section.

Removed in this same pull: dev's issue page renderer in src/web/pages/issues.ts and the thread page duplication (src/web/pages/thread.ts where it repeats it), and the "Read the details ?mode=dev" link.

The path: a person arrives from a post or a list, to follow a tell and answer it; primary action reply; next the change that answers it.

Acceptance.

• [ ] One renderer for this job, for every repository and every viewer; the other code and its tests are deleted, not hidden.
• [ ] Every old URL still answers (the survivor, or a redirect); ?mode=dev on it shows the survivor.
• [ ] Nothing the removed screen did is lost: the pull lists each thing it showed or did and where it lives now (or why nobody needs it).
• [ ] Minimal, not bare: one primary next action, white space at every width, nothing the person does not need now.
• [ ] Looks of the path at phone and desktop widths on the pull; the full check green.

Start from: src/web/studio/tell.ts, src/web/pages/issues.ts, src/web/pages/thread.ts, src/web/studio/nouns.ts.

Must not touch: the release workflow, the chart, other repositories.