feat(cli+mcp): vertical extractor support (28 extractors discoverable + callable)

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).

Cargo.lock

@@ -3199,7 +3199,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-cli"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "clap",
  "dotenvy",
@@ -3220,7 +3220,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-core"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "ego-tree",
  "once_cell",
@@ -3238,7 +3238,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-fetch"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "async-trait",
  "bytes",
@@ -3263,7 +3263,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-llm"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "async-trait",
  "reqwest",
@@ -3276,7 +3276,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-mcp"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "dirs",
  "dotenvy",
@@ -3296,7 +3296,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-pdf"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "pdf-extract",
  "thiserror",
@@ -3305,7 +3305,7 @@ dependencies = [
 
 [[package]]
 name = "webclaw-server"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "anyhow",
  "axum",