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/src/cli/mod.rs

@@ -18,6 +18,7 @@ pub mod install_skill;
 pub mod interaction;
 pub mod logs;
 pub mod navigate;
+pub mod network;
 pub mod render_error;
 pub mod screenshot;
 pub mod session;
@@ -37,6 +38,7 @@ use crate::cli::human_loop::RequestHelpArgs;
 use crate::cli::install_skill::InstallSkillArgs;
 use crate::cli::interaction::{ClickArgs, FillArgs, PressArgs, SelectArgs};
 use crate::cli::navigate::{NavigateCommand, NavigateHistoryArgs, ReloadArgs};
+use crate::cli::network::NetworkArgs;
 use crate::cli::screenshot::ScreenshotArgs;
 use crate::cli::session::SessionCmd;
 use crate::cli::snapshot::SnapshotArgs;
@@ -120,6 +122,9 @@ pub enum Command {
     /// Read buffered console/log/exception messages.
     Console(ConsoleArgs),
 
+    /// Read buffered network responses / failures.
+    Network(NetworkArgs),
+
     /// Dump raw HTML for a tab or a snapshot ref.
     #[command(name = "get-html")]
     GetHtml(GetHtmlArgs),