chore: refresh the tool, domain and browser coverage tables

[kleyt0n]

Problem

The tables cover 18 tools, 30 AI domains, 10 browsers and 3 token sources. README.md says they are best-effort and expected to go stale, and CHANGELOG.md:64 lists staleness as a known limit.

Why it matters

A tool absent from the tables is simply not reported — nothing is misattributed, which is the right failure mode, but the omission is invisible to the user.

What to do

• Sweep for AI coding agents, editors and assistants released since the tables were written.
• Sweep for new AI domains worth counting.
• Edit the const catalogues in src/scan/tooling.rs and src/scan/sites.rs, and update docs/reference/coverage.md, README.md and the icon set under docs/assets/tools/ (recording origins in SOURCES.md).
• Recurring — reopen or refile periodically rather than closing for good.

Acceptance

Counts in README.md, docs/reference/coverage.md and the source catalogues agree, and the detection tests cover any new entry.