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Wires the vertical extractor catalog into both the CLI and the MCP
server so users don't have to hit the HTTP API to invoke them. Same
semantics as `/v1/scrape/{vertical}` + `/v1/extractors`.
CLI (webclaw-cli):
- New subcommand `webclaw extractors` lists all 28 extractors with
name, label, and sample URL. `--json` flag emits the full catalog
as machine-readable JSON.
- New subcommand `webclaw vertical <name> <url>` runs a specific
extractor and prints typed JSON. Pretty-printed by default; `--raw`
for single-line. Exits 1 with a clear "URL does not match" error
on mismatch.
- FetchClient built with Firefox profile + cloud fallback attached
when WEBCLAW_API_KEY is set, so antibot-gated verticals escalate.
MCP (webclaw-mcp):
- New tool `list_extractors` (no args) returns the catalog as
pretty-printed JSON for in-session discovery.
- New tool `vertical_scrape` takes `{name, url}` and returns typed
JSON. Reuses the long-lived self.fetch_client.
- Tool count goes from 10 to 12. Server-info instruction string
updated accordingly.
Tests: 215 passing, clippy clean. Manual surface-tested end-to-end:
CLI prints real Reddit/github/pypi data; MCP JSON-RPC session returns
28-entry catalog + typed responses for pypi/requests + rust-lang/rust
in 200-400ms.
Version bumped to 0.5.2 (minor for API additions, backwards compatible).
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