Add agent-friendly network inspection tools

[V3RON]

Summary

• add a first-class network command family with normalized CDP capture, a bounded live buffer, persisted network start/network stop sessions, compact summaries, filtered request lists, and explicit drill-down commands for request details, headers, and bodies
• keep the default CLI output agent-friendly by returning bounded summaries first while preserving --verbose metadata and file export for full request or response bodies when needed
• document the new network workflow and current v1 limitations in the README and bundled core skill, and cover the capture, store, query, and body-export paths with tests

Backward compatibility

• existing daemon, target, console, trace, memory, heap snapshot, JS memory, allocation, and CPU profiling commands are unchanged
• CLI defaults remain compact and non-JSON; the new behavior is additive under the network command family only
• daemon IPC remains newline-delimited JSON, and the network collector follows the existing attach/detach lifecycle without changing other command families
• the live network buffer is intentionally bounded to the most recent 200 requests, and persisted network sessions intentionally start empty without backfilling earlier live-buffer entries

Risks

• some targets expose incomplete or inconsistent Network.* metadata, so timing, size, protocol, cache, headers, or body availability may be partial depending on runtime support
• response body retrieval for persisted sessions depends on the body being fetchable while the target is still connected when the session stops
• reconnects reattach the network collector on demand, so long disconnect windows may leave gaps in capture until the next network command forces a reconnect
• WebSocket visibility is handshake-only in v1 and may not meet expectations for full frame-level inspection

Manual testing

• start a debuggable Chrome, Node, or React Native target and select it with agent-cdp start, agent-cdp target list, and agent-cdp target select <id>
• run agent-cdp network status and confirm it reports an attached collector plus the live-buffer capacity
• run agent-cdp network start --name login-flow, reproduce a request-heavy interaction, then run agent-cdp network stop and confirm it returns a net_* session id
• run agent-cdp network summary --session <net_id> and agent-cdp network list --session <net_id> --status failed to verify compact summaries and filtering
• run agent-cdp network request --session <net_id> --id <req_id>, agent-cdp network response-headers --session <net_id> --id <req_id>, and agent-cdp network response-body --session <net_id> --id <req_id> --file ./response.txt to verify drill-down metadata, explicit header lookup, and body export

Closes #2