feat!: remove the discover command and Discover API integration

[nirsha-brd]

Removes brightdata discover / bdata discover and its integration with the Bright Data Discover API (POST/GET https://api.brightdata.com/discover). This is the inverse of #3, which added the command. ## Changes | File | Change | |---|---| | src/commands/discover.ts | deleted | | src/types/discover.ts | deleted — verified nothing outside the discover command imported it | | src/__tests__/commands/discover.test.ts | deleted | | src/index.ts | dropped the import and the program.addCommand(discover_command) registration | | src/__tests__/utils/help.test.ts | dropped the discover case from the "every customer-facing command has Examples in --help" coverage table | | README.md | removed the command-table row, the table-of-contents entry, and the ### discover reference section | src/__tests__/utils/help.test.ts is worth a look in review — it was added after #3, so it is not in that PR's file list, but it imports discover_command and would fail to compile without this change. ## Verification - pnpm run type-check — clean, exit 0 - pnpm run build (tsc) — clean, exit 0 - pnpm test — no new failures. This suite is already red on main in a Windows environment; I captured a baseline before making any change and the failing set is byte-for-byte identical: | | Test files | Tests | Failing files | Failing tests | |---|---|---|---|---| | baseline (main) | 29 | 360 | 5 | 8 | | this branch | 28 | 344 | 5 | 8 | The deltas are exactly the removed discover.test.ts (1 file, 16 tests). The same 8 tests fail before and after, all in browser/ipc, browser/lifecycle, commands/browser, utils/config and utils/mcp-config — socket, daemon-spawn and POSIX file-permission assertions that do not hold on Windows. None are related to this change. - node dist/index.js --help — discover is gone; all 15 remaining commands still register. - Repo-wide search for discover (excluding node_modules) returns zero matches. ## Migration Use brightdata search to find sources and brightdata scrape to read them. ## Note for reviewers Rebased 2026-08-30 onto current main (0.3.5). The version bump was dropped from this PR: since this removes a public command, the release that ships it should carry the version signal, and that call belongs to the release process. ## Out of scope brightdata/skills still ships a discover-api skill whose CLI section documents bdata discover, and its live-research and rag-pipeline skills are built on Discover. Those need a follow-up PR.