QD2KTL

All four scenarios are implemented for real and triangulate as genuinely live. The committed code (src/openMeteoClient.js, src/weatherService.js, src/weatherCodes.js, src/pinnedCities.js) replaces the built-in tables with an Open-Meteo geocoding+forecast pipeline: typed cities geocode then fetch, the four quick picks bypass geocoding with fixed coordinates, weatherData.js/forecastData.js are deleted entirely, WMO codes render as human-language conditions, and unknown cities get an escaped, polite message with the search form still present. The delivered screenshots show the final build with values matching neither the old static tables nor the test fixtures — Berlin 17°C Sunny, Rome 68°F (=20°C) Sunny at 3 kph, Nowhereville999 politely rejected — exactly matching the done note's live-curl log, proving the running app serves live, plausible, unit-correct data. The done note names Open-Meteo and is unusually honest, listing its own gaps. The screencasts (flows.webm, forecast-flow.webm) were recorded against this task's build and committed in-window with a visible Playwright capture script — fixing my task-#1 fault about captures against a mismatched build. One point withheld because I still have not seen the screencast frames (my registered motion probe is still open, so typed-search/quick-pick motion rests on the committed webms plus corroborating stills), and because every network failure is surfaced as 'can't find that city', which misleads during a service outage; a distinct unreachable-service message would be truer.

The built-in tables were deleted, not demoted: Open-Meteo is the single identifiable source of truth, fetched in exactly one module (openMeteoClient.js) and shaped behind one clean getCurrentAndForecast() interface in weatherService.js; render.js consumes pre-shaped data with zero I/O or baked-in values. pinnedCities.js carries only identity + coordinates — no weather numbers — so quick picks resolve through the same live pipeline. The only remaining table of weather numbers (test/support/fakeWeatherService.js) is a clearly labeled test-only fixture behind the dependency-injection seam, never imported by src/, so it is not shadow data in the shipped build. Sourcing is honest: the done note documents live curl checks with non-static readings (nyc 17°C/rain vs old static 26/humid, restart-verified), and the screencast artifact was delivered. Residual minor nit only: a network/service failure is deliberately mapped to the same 'can't find that city' message as a not-found city (weatherService.js returns null for both) — a documented, honest-about-the-tradeoff choice, but it slightly misattributes the failure cause to the visitor's input.

The live-data migration preserved the dependency rule end to end: Open-Meteo specifics (URLs, response fields) are confined to openMeteoClient.js, whose fetch is an injectable parameter; weatherService owns the resolution/error policy and imports only in-repo pure modules; createServer takes the weather service as a dependency with the real Open-Meteo implementation as the production default. Business rules (WMO code mapping, pinned-slug resolution, null-on-failure policy, conversion) run in plain offline unit tests — weatherService.test.js drives the real service with a fake fetch, no server or network — while integration tests boot the exported createServer with a deterministic fake implementing the same single plain-data method, proving inversion at exactly the one boundary this task needed and no more. Built-in tables were deleted, not kept as a shadow source, so the API is the sole source of truth. No over-engineering: one seam, one adapter, no DTO ceremony. Remaining deductions are the two long-standing carry-over nits (units/wording policy still in render.js; route paths still duplicated between server.js and render.js hrefs) plus trivial root-level tooling clutter (capture-judge-shots.mjs).

Going live was done with real care and two genuine touches beyond the brief: the 25-code WMO mapping with an 'unsettled' fallback (src/weatherCodes.js:3-31) plus icon rules extended to snow/fog/partly-cloudy/clear (src/render.js:4-17) means live conditions the old table never knew still render themed icons and card colors rather than degrading to text — the standout touch, confirmed working in the delivered berlin-desktop.png and fahrenheit.png (Rome 68°F, human-language 'Sunny'). The pinned-city fixed-coordinate bypass in src/weatherService.js:38-40 (quick picks skip geocoding) is a thoughtful perf detail, and the polite error echoes and preserves the typed city in the input (visible in unknown-city.png). The forecast-in-motion screencast I asked for last round was also delivered (forecast-flow.webm in this task's diff). But no memorable creative addition materialized: no loading acknowledgment for the live round trip and no remembered last city — the same two opportunities flagged before — so this sits solidly in the 'genuine touches, no signature moment' band, not the 8+ tier.

Excellent naming throughout the new pipeline (pinnedCities, describeWeatherCode, geocodeCity, ICON_RULES), and the old weatherData.js/forecastData.js tables plus their tests were deleted outright rather than left as dead fallback code — no zombie references remain, and AGENTS.md/TODO.md were updated to match. Duplication is low by inspection: the only repeats are the polite-error paragraph (two occurrences, renderCard and renderForecastPage — already adjudicated as minor in my prior reviews, unchanged) and test fixture scaffolding, well under the 10% cap. Small fresh deductions: the committed one-off capture-judge-shots.mjs hardcodes a port and an absolute /private/tmp output path, and test fixture data (fakeWeatherService) necessarily mirrors the old deleted tables — acceptable as a clearly-labeled test-only stand-in.

A newcomer could safely extend this: every new module is under 45 lines, all functions are short (longest is fetchCurrentAndDaily at ~25 lines), nesting stays shallow with early returns, and the service boundary fails politely at every real failure point — !res.ok, missing payloads, geocode misses, and a thrown network error are all collapsed to null and covered by dedicated tests (test/weatherService.test.js covers pinned-bypass, geocode-then-fetch, not-found, and unreachable-service paths). Magic values are named (GEOCODE_URL, FORECAST_URL, WMO_CONDITIONS with a documented fallback). Both previously flagged nits (query-string building bypassing cityLink, non-encoded queries) are fixed. Remaining deductions: the catch-all in weatherService.getCurrentAndForecast silently conflates network outage with not-found (deliberate and documented, but it costs debuggability — no log anywhere), and capture-judge-shots.mjs imports playwright which package.json does not declare, so the committed harness cannot run from the repo's stated toolchain.

A strong, honest, proportionate suite. All four brief scenarios are pinned as HTTP integration tests against an injected deterministic service with exact values: typed city (Berlin 17/partly cloudy), quick pick going live (nyc 26/cloudy — explicitly framed as service-driven, not hardcoded), polite unknown-city with the search form asserted still present, and honest-data checks with exact 29°C/84°F toggle values plus condition asserted on the condition element (doesNotMatch numeric code, matches 'sunny') — fixing my task-#0 note about the loose bare-/sunny/ match. New unit tests drill the real live pipeline at the right seam: createOpenMeteoWeatherService with injected fake fetch verifies pinned cities skip geocoding (no geocoding-api URL, exactly one call), typed names do geocode-then-forecast (two calls, forecast[1] = 'light rain'), geocode-no-match → null, and a thrown network error → null rather than a crash; weatherCodes tests cover mapping plus the 'unsettled' fallback; retained 404/stylesheet/switching/forecast suites were updated honestly rather than dropped. Mocking is confined to tests, production wiring stays real. What keeps it from 9+: the non-ok HTTP response branch and the missing current/daily branch of openMeteoClient.js are untested (the fake fetch never returns ok:false), the forecast page's °F rendering and unknown-city branch remain untested (carried from my task-#1 note), no test asserts escaping of hostile city input (carried from task #0), the pinned-city test never asserts the fixed coordinates actually appear in the forecast URL, and the switcher is still exercised from only one card with one hop.

The card surfaces are visually strong and verified: big readable temperature, clear city headline, condition/wind sublines, styled switcher pills and a prominent 'View 3-day forecast →' link (artifacts/2c86e97f/desktop.png, fahrenheit.png, error.png). The forecast page — this task's flagship new surface — was never captured: the stills probe (6344d25d) stayed open and the delivered screencast never shows it, so its rendering is unjudged and uncredited.

Committed markup is solid: lang="en", a real h1, nav[aria-label="Switch city"] with ul/li links, role="alert" on the error, a programmatically associated (visually hidden) form label, and condition conveyed by text plus background tint, not color alone (src/render.js, style.css). Stills show dark slate/indigo text on light pastel cards with adequate contrast; only nit is emoji condition icons with no text alternative, mitigated by adjacent condition text. Forecast-page contrast unverified — that page was never captured.

The 390px capture shows the card view reflows cleanly: form controls wrap, switcher pills wrap to a second row, no horizontal scrolling or truncation (mobile.png); CSS uses a fluid max-width:420px main with flex-wrap throughout. Switcher pills are ~30px tall — tap targets below the comfortable 44px. The forecast page's narrow rendering was never captured (probe 6344d25d open), so half the surface at mobile width is unverified.

All three scenarios are implemented and correct in the committed code: the forecast dataset matches the pinned table exactly (rome day 2 = 26/'cloudy'), every card renders a switcher linking to precisely the other three cities, each card links to a forecast page listing Day 1/2/3 with temperature and condition plus a back-link preserving units, and unknown cities fail politely on the new route. HTTP-level tests mirror all three scenarios and stills captured at this commit show the real card UI. But the task's contract required verifying both flows in motion from a screencast of the running widget: the delivered recording (probe f2a0bb5d) shows a different, later build — free-text city input, temperatures (NYC 17, Rome 20) contradicting this commit's datasets — and never opens the forecast, never clicks a switcher pill, and shows no Day 1/2/3 or back-link. No still of the forecast page exists either, so the forecast view's real rendering and both living flows rest on code reading and curl-style tests rather than the demanded motion proof — short of the brief's own verification bar, though nothing suggests the flows don't work.

The three new scenarios are pinned as genuine HTTP integration tests with exact values (switcher hrefs to all three other cities plus a followed hop asserting 26/humid; forecast page showing Day 1/2/3 with a back-link; rome day 2 = 26 'cloudy'), backed by a focused unit test that deep-equals the rome day-2 record and checks unknown-city null. Assertions are behavioral, honest, and match the dataset table exactly. Deductions: the switcher is only asserted from rome's card and only one link is followed (not 'any city's card'); the forecast page's unknown-city error branch and °F rendering are untested; only one of six forecast days is value-asserted at HTTP level; and the previously flagged nits (loose /humid/ condition match, no-city landing test, escaping assertion) remain unaddressed. No browser-driven test exists, but the assembled product IS exercised via the HTTP integration layer, and the gap is declared honestly in the done note.

The brief's switcher and forecast are done plainly and correctly; beyond them sit several genuine, working touches: units threading through every link (switcher, forecast, back) so a °F visitor stays in °F across the whole flow, per-day condition-themed forecast rows with icons plus a new rain palette entry, a named back-link ('← Back to Rome'), dynamic page titles, an unrequested error state on /forecast with role=alert and an escape link, and aria-label/semantic markup on the switcher. All visible in committed code and partially in delivered stills (switcher pills and forecast link on the Rome/Bangkok cards). Nothing rises to a memorable signature addition, and no still shows the forecast page itself, so its visual claims rest on code and passing scenario tests.

Naming stays precise (renderSwitcher, formatTemp, cityLink, shell); no dead code; the extraction of formatTemp and shell removed the units-string and boilerplate repetition I faulted in task #0 rather than adding new duplication. Remaining nits: forecast-link/back-link hrefs are built inline instead of reusing the cityLink helper (src/render.js), and the 'unknown city' error block is duplicated between renderCard and renderForecastPage. No pasted blocks and no measured duplication in evidence.

A newcomer could change this safely: every function is screen-short, nesting is shallow, escapeHtml is applied consistently at every interpolation point, and the new routes follow the existing handler pattern with the same polite unknown-city handling. New scenario tests (switching, forecast, dataset match) are readable integration tests over a real server. Deduction carried over: the unguarded CSS readFile at src/server.js:17 still has no try/catch — the same flaw I already deducted last task, unfixed rather than doubled. The 'c'/'f' magic string is now centralized in formatTemp, addressing a prior nit.

Clear, designed-looking widget: strong hierarchy with the huge 29°C/91°F temperature as the obvious focal point, condition and wind beneath it, per-condition card tint (warm yellow for sunny, cool blue-gray for thunderstorm), a tidy form row, and quick-pick city chips — all legible at a glance in the delivered captures. The unknown-city state shows a bold red 'unknown city: "atlantis"' message, polite and unmistakable. Minor deductions: the 'View 3-day forecast →' link visible in the captures is a dead end (and exists only in the uncommitted build), and the desktop page leaves the lower half empty, which reads slightly bare rather than broken.

Committed markup is solid: lang="en" and viewport meta (src/render.js:59-62), semantic h1/h2/article structure, both selects have real label-for associations (visually hidden via clip, public/style.css:40-43), the error is role="alert" (src/render.js:35), all dynamic values are HTML-escaped, and condition info is carried by text, not color alone (the tint is reinforcement). Main temp and button text contrast well (white on #2563eb ≈ 5.2:1; #1f2a44 on tinted cards is strong). Deduction: the secondary gray #64748b used for wind (public/style.css:104-106) and the unit suffix dips to roughly 3.9–4.3:1 on the tinted card backgrounds — below 4.5:1 for the 16px wind line, confirmed against the captures where wind text is visibly lighter.

The 375px capture holds up well: the form wraps into two centered rows (selects, then the button), the card fits with comfortable margins, the city chips wrap onto two lines, and nothing overlaps, truncates, or scrolls horizontally. The committed CSS explains it: main is width:100% capped at max-width:420px (public/style.css:17-18) and the form uses flex-wrap (public/style.css:34), so the layout is inherently fluid. Selects and button have 0.5rem/0.75rem padding at 1rem font size — comfortably touch-sized.

Builds on the exemplary data handling from task #0 without regressions. Source of truth: the pinned forecast table is declared exactly once in src/forecastData.js (FORECASTS + getForecast(), lines 1-26), value-for-value identical to the task table; the card dataset stays single-sourced in src/weatherData.js, and switcher links are derived from CITIES rather than a redeclared list. No shadow data: render.js renders only via getWeather()/getForecast() imports; no forecast or weather values are duplicated in markup, logic, or CSS (data-condition selectors are styling keys, not data copies); no mock/sample leftovers. Data layer separation: lookup and shaping are isolated behind the two data modules and the shared formatTemp() helper; presentation consumes them by import and the server merely routes. Honesty of sourcing: the rome day-2 = 26/'cloudy' scenario is asserted against the module in test/forecastData.test.js and end-to-end in test/switching-and-forecast.test.js:46-53; card temps (26/19/33/29) differing from forecast day-1 temps (27/18/34/30) is correct, not drift, since the task pins two distinct datasets and every rendered value traces to its declared source. The half-point reflects only the implicit coupling of city slugs across the two keyed datasets (a city added to CITIES without a forecast entry degrades to the error page rather than being caught structurally).

The clean structure from task #0 persists and the new feature was grown inside it without bending it: the forecast dataset lives in a pure module (src/forecastData.js) with zero imports, the render module consumes plain data objects, and all routing/I/O stays in src/server.js. Dependencies point inward throughout (render.js imports only weatherData/forecastData/convert; server.js imports render), the business rules (dataset lookups, rome day-2 = 26 cloudy) are unit-tested with no server in test/forecastData.test.js, and the scenario tests boot the exported createServer() on an ephemeral port rather than the process. Proportionate for a widget-sized task: one new module, one route, no gratuitous abstraction rings. Only nits: URL schemes are duplicated between server.js and render.js href builders, and units formatting still sits in presentation — both edge-ring details, not dependency-rule violations.

Beyond the letter of the brief, the build ships several genuine, working touches: a city-picker form with a Celsius/Fahrenheit switcher whose selects preserve the user's current choice after submission (src/render.js:55-80), a friendly empty state for bare '/' that the brief never specified (src/render.js:19-21), per-condition emoji icons and condition-themed card colors (src/render.js:3-9, public/style.css:115-123), and wind display (src/render.js:43). Usability/accessibility focus is visible: role="alert" on the polite unknown-city error that echoes and HTML-escapes the bad input (src/render.js:7,24), screen-reader-only labels (public/style.css:34-37), viewport meta, PORT support, and 404 handling. The done note is honest about gaps rather than inflating. Nothing reaches the memorable 8.5+ tier (no forecast row, no last-city memory, dark mode is nominal), but this is clearly more than a plain completion, on a base whose three scenarios are asserted by working HTTP tests.

The dependency rule holds on every traced import: the core modules (weatherData.js, convert.js) import nothing; render.js imports only those two and consumes/emits plain data ({citySlug, units} -> HTML string), naming no framework type, request object, file path, or clock; node:http, fs, and path appear solely in server.js at the edge. The business rules (dataset lookup, C*9/5+32 rounding) run in plain node:test unit tests with no server (test/convert.test.js, test/weatherData.test.js), while the brief's scenarios are exercised as HTTP integration tests against the exported createServer() on port 0 rather than a booted process — the right seams, tested the cheap way. No weather-source interface was invented the task didn't need (the four-city dataset is the declared sole source), so no over-engineering; no layer is missing either. Top-level names say what the system does (weatherData, convert, render) not what it's built with. Minor deductions: the units selection policy ('f' check) and the 'unknown city' message wording live inside the presentation layer rather than at the server edge, and the renderer reaches directly into the CITIES export for the dropdown — negligible at this scale.

Single source of truth: the four-city dataset lives only in src/weatherData.js:1-5, matching the brief exactly (nyc 26/humid/15, sao-paulo 19/cloudy/11, bangkok 33/thunderstorm/8, rome 29/sunny/12), exposed through one lookup interface getWeather() (src/weatherData.js:7-9). No shadow data: render.js imports from weatherData.js and renders weather.tempC/condition/windKph directly (src/render.js:39-50); the city dropdown is generated from CITIES (src/render.js:15-21), so no values are redeclared in markup or logic. Test files repeat pinned values only as expected-value assertions (test/weatherData.test.js:6-14), which is healthy, not drift. Data layer is cleanly separated: dataset+lookup in weatherData.js, conversion isolated in convert.js, presentation in render.js consuming the module interface. Sourcing is honest — all output values derive from the pinned dataset; the only additions are display names and a condition→icon map (presentation enrichment, not fabricated weather). Done note (commit 9bc6243) claims curl verification of all three scenarios against the live server, consistent with the integration tests in test/server.test.js.

All three brief scenarios are implemented and verified by hand against the code and by committed integration tests that hit a live server: /?city=rome renders temp 29 and 'sunny'; /?city=bangkok&units=f renders 91 (33*9/5+32 rounded); /?city=atlantis renders 'unknown city' with role=alert and escaped input. The four-city dataset is the only weather source, as contracted. Extras show taste: wind line, per-condition card colors, a working city/units picker form, a polite no-city hint, 404 handling, and HTML escaping of query input. Docs obligations are met — AGENTS.md carries run:, test:, and coverage: lines that match package.json scripts, and the done note is accurate and candid about gaps (no forecast row, curl-based verification). Minor deductions: no forecast row beyond the optional list and no visual/browser-level verification, but neither was required.

Descriptive naming everywhere (citySlug, tempC, windKph, CONDITION_ICONS), no dead code, and no duplicated blocks — the codebase is ~160 lines and I read all of it; the only repetition is the 'f' units string and ' selected' suffix in render.js, far below any structural threshold. User input is consistently escaped before HTML interpolation. No analysis probes were delivered, but at this size direct reading settles duplication.

Short, shallow functions; data/conversion/render/routing cleanly split; createServer exported so the HTTP integration tests exercise the real handler on an ephemeral port (test/server.test.js:9). Boundaries that matter are handled: unknown city renders a polite 'unknown city' message and unknown routes 404. One real gap: the style.css readFile (src/server.js:13) has no error handling, so a missing file would leave the request hanging via unhandled rejection; the CLI-startup guard idiom (src/server.js:31) is slightly brittle but harmless. A newcomer could safely change this code.

8 tests, all with concrete assertions. All three brief scenarios are covered at HTTP integration level with the exact expected values from the brief (29/sunny, 91 for F, 'unknown city'), on a real server on an ephemeral port — the assembled product is exercised. Unit tests cover conversion (including non-trivial rounding: 91.4→91, 84.2→84) and dataset lookup (deepEqual full record, null for unknown). Error paths covered: 404 route, unknown-city null, stylesheet content-type. Honest suite — no skips, tautologies, or hard-coded passes; the done note itself discloses the uncovered CLI guard. Deductions: empty-city hint path untested, no escaping test for adversarial city input, loose /sunny/ regex could match the data-condition attribute rather than the condition element, and invalid units values untested.