docs(readme): retake the screenshots against the reworked pages

[Fl0p]

The README hero shot was taken before the Overview rework. It showed the user-search cloud that has since been deleted, Sessions at the top of the page, KPI labels hardcoded to (30d), and no range switcher — a picture of software that no longer exists.

What is in here

• New hero — the current Overview: range switcher in the header, KPI row, the Users top-5 block, History.
• New ## Screens gallery — Sessions, Costs, Users, Tools.
• scripts/seed-demo.py — fills a throwaway instance with a synthetic team (7 users, 3 models, 90 days, ~485 sessions / ~25 600 spans). It goes in over the OTLP endpoint rather than writing to DuckDB, so the numbers on the page are what ingest, cost derivation and the roll-up actually produce. Fixed RNG seed, so a re-run against a fresh volume reproduces the same figures.
• scripts/shoot-screenshots.mjs + docs/operations/screenshots.md — the retake recipe. Each page is cropped at the bottom edge of a named element, not at a pixel count, so a row-height or chart-size change cannot slice a card in half next time.

Two stale things the retake surfaced, fixed here: the logo <img src="assets/logo.svg"> pointed at a path that does not exist in the repo (broken image on GitHub) and the "current release" tag still read :0.2.

Why synthetic data

Real telemetry carries real user names and real spend, and a screenshot is forever. The seeder sends only the attributes Claude Code actually sends — in particular no command on Bash spans — so the Tools page shows the same "no command detail in this data" state a real install sees rather than advertising a view nobody gets.

Verification

• docs/ VitePress build: vitepress build → build complete in 5.95s, no dead links (the Deploy Docs job fails fatally on those).
• Screenshots taken from cotel:flo592 built from this branch's base (2ff50d4), seeded, then shot with the committed scripts/shoot-screenshots.mjs — the committed script is what produced the committed images.
• No Go or frontend source touched.

🤖 Generated with Claude Code

[coderabbitai]

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[Fl0p]

Squash-merged to main as f0fd755 (locally, to keep author+committer = agent identity per the repo's merge rule). Board approved the visual review on FLO-592.