feat: harden remote serve and reuse connections

- Gate TCP serve commands with safe-by-default policies, per-key allow tokens, per-key rate limiting, and audit labels.
- Reuse authenticated encrypted remote sessions and parallelize/caches multi-browser fanout to reduce repeated handshake roundtrips.
- Increase paged native-host batch size with extension-side byte budgeting to speed large tab listings safely.
- Point install output at public Chrome Web Store / Firefox AMO listings by default, with --dev preserving unpacked workflows.
- Share search-engine metadata between CLI and SDK and bump the package/extension version to 0.16.0.
- Cover the new security, pooling, paging, install, and fanout behavior with expanded Python and extension tests.

browser_cli/commands/search.py

@@ -1,61 +1,10 @@
 import click
 from browser_cli.commands import client_from_ctx, handle_errors
 from rich.console import Console
+from browser_cli.search.engines import DISPLAY_NAMES, SUBCOMMANDS
 
 console = Console()
 
-ENGINES = {
-    "google":        "https://www.google.com/search?q={query}",
-    "brave":         "https://search.brave.com/search?q={query}",
-    "duckduckgo":    "https://duckduckgo.com/?q={query}",
-    "ddg":           "https://duckduckgo.com/?q={query}",
-    "youtube":       "https://www.youtube.com/results?search_query={query}",
-    "yt":            "https://www.youtube.com/results?search_query={query}",
-    "spotify":       "https://open.spotify.com/search/{query}",
-    "amazon":        "https://www.amazon.com/s?k={query}",
-    "ecosia":        "https://www.ecosia.org/search?q={query}",
-    "furaffinity":   "https://www.furaffinity.net/search/?q={query}",
-    "fa":            "https://www.furaffinity.net/search/?q={query}",
-    "bing":          "https://www.bing.com/search?q={query}",
-    "github":        "https://github.com/search?q={query}",
-    "wikipedia":     "https://en.wikipedia.org/wiki/Special:Search?search={query}",
-    "wiki":          "https://en.wikipedia.org/wiki/Special:Search?search={query}",
-    "reddit":        "https://www.reddit.com/search/?q={query}",
-    "stackoverflow": "https://stackoverflow.com/search?q={query}",
-    "so":            "https://stackoverflow.com/search?q={query}",
-}
-
-_DISPLAY_NAMES = {
-    "google": "Google", "brave": "Brave Search", "duckduckgo": "DuckDuckGo",
-    "ddg": "DuckDuckGo", "youtube": "YouTube", "yt": "YouTube",
-    "spotify": "Spotify", "amazon": "Amazon", "ecosia": "Ecosia",
-    "furaffinity": "FurAffinity", "fa": "FurAffinity", "bing": "Bing",
-    "github": "GitHub", "wikipedia": "Wikipedia", "wiki": "Wikipedia",
-    "reddit": "Reddit", "stackoverflow": "Stack Overflow", "so": "Stack Overflow",
-}
-
-_SUBCOMMANDS = [
-    ("google",        "Search with Google."),
-    ("brave",         "Search with Brave Search."),
-    ("duckduckgo",    "Search with DuckDuckGo."),
-    ("ddg",           "Search with DuckDuckGo (alias for duckduckgo)."),
-    ("youtube",       "Search YouTube videos."),
-    ("yt",            "Search YouTube (alias for youtube)."),
-    ("spotify",       "Search Spotify."),
-    ("amazon",        "Search Amazon."),
-    ("ecosia",        "Search with Ecosia."),
-    ("furaffinity",   "Search FurAffinity."),
-    ("fa",            "Search FurAffinity (alias for furaffinity)."),
-    ("bing",          "Search with Bing."),
-    ("github",        "Search GitHub."),
-    ("wikipedia",     "Search Wikipedia."),
-    ("wiki",          "Search Wikipedia (alias for wikipedia)."),
-    ("reddit",        "Search Reddit."),
-    ("stackoverflow", "Search Stack Overflow."),
-    ("so",            "Search Stack Overflow (alias for stackoverflow)."),
-]
-
-
 @click.group("search")
 def search_group():
     """Search the web — open a query in a search engine."""
@@ -70,10 +19,10 @@ def _build_command(engine_key: str, help_text: str) -> click.Command:
         terms = " ".join(query)
         client_from_ctx().nav.search(engine_key, terms, window=window, group=group)
         suffix = f" in group '{group}'" if group else (f" in window '{window}'" if window else "")
-        display = _DISPLAY_NAMES.get(engine_key, engine_key.capitalize())
+        display = DISPLAY_NAMES.get(engine_key, engine_key.capitalize())
         console.print(f"[green]Searching[/green] [cyan]{display}[/cyan]: {terms}{suffix}")
 
     return _cmd
 
-for _name, _help in _SUBCOMMANDS:
+for _name, _help in SUBCOMMANDS:
     search_group.add_command(_build_command(_name, _help))