feat: add bsk network read-only command

Add `bsk network` as a sibling of the `console` command from #7,
reading the buffered network responses / failures for a tab. Fills the
remaining half of the request in #2 (console landed in #7; network did
not).

Mirrors the console command's conventions exactly:

  bsk network --session <id> [--tab-id N] [--since C]
                             [--limit N] [--max-text-chars N]

The extension enables `Network` on attach (best-effort) and buffers
`responseReceived` / `loadingFailed` events per tab with a monotonic
sequence, correlating them to `requestWillBeSent` for method/URL. Reads
are cursor-paginated (`since` -> `next_since`) and bounded (`limit`,
`max_text_chars`) for agent-context safety, same as console. Entries
carry the real HTTP status code (response) or the CDP failure reason
(failure) — things `performance.getEntriesByType('resource')` can't
give.

Classified read-only (pass-through under the pending-interrupt gate);
defaults to the Agent Window's active tab.

Wires bsk-protocol (Method + params/result/entry structs + schema),
bsk-cli (network subcommand + daemon dispatch allow-list) and the
extension (handler + dispatcher route), with unit / parse / IPC tests
paralleling the console command.

Refs #2.

crates/bsk-cli/tests/cli_parse.rs

@@ -104,6 +104,41 @@ fn rejects_zero_console_bounds() {
     );
 }
 
+#[test]
+fn parses_network_command_with_context_safety_flags() {
+    let cli = parse(&[
+        "bsk",
+        "network",
+        "--session",
+        "s1",
+        "--tab-id",
+        "9",
+        "--since",
+        "12",
+        "--limit",
+        "75",
+        "--max-text-chars",
+        "2048",
+    ]);
+    let Command::Network(args) = cli.command else {
+        panic!("expected network command");
+    };
+    assert_eq!(args.session, "s1");
+    assert_eq!(args.tab_id, Some(9));
+    assert_eq!(args.since, Some(12));
+    assert_eq!(args.limit, Some(75));
+    assert_eq!(args.max_text_chars, Some(2048));
+}
+
+#[test]
+fn rejects_zero_network_bounds() {
+    assert!(Cli::try_parse_from(["bsk", "network", "--session", "s1", "--limit", "0"]).is_err());
+    assert!(
+        Cli::try_parse_from(["bsk", "network", "--session", "s1", "--max-text-chars", "0"])
+            .is_err()
+    );
+}
+
 #[test]
 fn parses_install_skill_subcommand() {
     let cli = parse(&["bsk", "install-skill", "--list"]);