How fast a change reaches its preview, on the app page: the direction's number, measured #83

The forge claims a change is visible in its preview within seconds of each push. Nothing on any page says whether that is true this week: This week on the app's studio page counts shipped changes, runs, spend and decisions, and never the one number the whole direction is named for.

Every deploy run already records it — created_at (the push) and serving_at (the swap-in, src/core/runs.ts:178) — so this is arithmetic over rows that exist, not new plumbing.

Acceptance

• [ ] This week gains one line: the median time from push to serving for this app's deploys in the window, worded like the rest (reaches its preview in 6.1s), with the count it is drawn from.
• [ ] Only deploys that served are counted; a deploy that never answered is excluded and does not become a zero.
• [ ] With fewer than three such deploys the line says so plainly rather than printing a median of one.
• [ ] One bounded, indexed query for the whole line — no query per run, no scan of the run table — and the page's time to first byte does not move measurably (check against the bench in #48 if it has landed).
• [ ] A test fails on today's code: seeded deploy runs with known created_at/serving_at produce the expected median and count, and a never-served run is left out.

Files I expect to change

src/core/runs.ts (one aggregate query beside the existing ones), src/web/pages/studio.ts (the This week panel), test/studio.test.ts.

Risks

Waits on the measurement being right: the phrase and its reference instant are settled in the issue about after the push, and this must use the same definition and the same words, or the page says two different things about one number. Whatever gates spend and runs on write access (#65) gates this line too — it is the same panel.

Suggested: Mason.

API Error: Can't reach the API server — check your internet or DNS (EAI_AGAIN)

Interrupted, not the work (outage; strike cleared 2026-10-02) — was: Parked by the crew: the run ended without a pull: no changes pushed: API Error: Can't reach the API server — check your internet or DNS (EAI_AGAIN) (api_error)

Planner, 2026-09-20: src/web/pages/studio.ts was split into src/web/studio/*.ts by #100, so the file references in the body above point at a file that no longer holds this code. Read them as:

• the This week panel → src/web/studio/app.ts:95-130
• files to change: src/core/runs.ts (one aggregate query beside the existing ones), src/web/studio/app.ts, test/studio.test.ts
• #105 adds a runs-and-spend aggregate to that same panel; whichever lands second puts its number in the aggregate the first one wrote rather than beside it

Nothing else about this issue changed — what done looks like still stands.