Add completion spec: iproute2 (ip)

[lucieleblanc]

Summary

Add top-level command completions for the ip command (iproute2), the standard Linux networking utility for managing routing, network devices, interfaces, and tunnels.

Linear ticket: APP-3969

What's included

Subcommands

All ip objects as subcommands: address, addrlabel, fou, help, ila, ioam, l2tp, link, macsec, maddress, monitor, mptcp, mroute, mrule, neighbour, netconf, netns, nexthop, ntable, route, rule, sr, tap, tcpmetrics, token, tunnel, tuntap, vrf, xfrm.

Global options

All global flags including -json, -brief, -netns, -family, -batch, -oneline, -color, -resolve, -statistics, -details, -human-readable, -pretty, -timestamp, -all, -Numeric, -Version, and protocol family shortcuts (-4, -6, -M, -B, -0).

Generators

• netns: Lists available network namespaces via ip netns list for the -netns flag

Scope

This PR covers top-level completions only. Individual subcommand completions (e.g., ip address add, ip link set) are tracked as child issues of APP-3969.

Research sources

• ip help output (iproute2)
• Fish shell completions for ip
• ip(8) man page

Testing

• script/presubmit passes (fmt, clippy, 54 tests)
• JSON spec formatted with prettier

Conversation: https://staging.warp.dev/conversation/d8ebb1e4-9630-4e31-88ce-01c4853128c1

This PR was generated with Oz.

[linear]

APP-3969 [Auto] Add ip completions

Add top-level command completions for ip — the list of subcommands (addr, link, route, etc.) and global flags. Individual subcommand completions are tracked as child issues.

Fish shell reference implementation: https://github.com/fish-shell/fish-shell/blob/master/share/completions/ip.fish

[lucieleblanc]

Generator Screenshot Validation: netns

netns generator — ip -n <Tab> (network namespace completions)

The netns generator runs ip netns list and produces network namespace name completions for the -n/-netns flag.

Test setup: Created two test namespaces (test_ns1, test_ns2) via ip netns add. Typed ip -n and pressed Tab to trigger completions.

Result: Both namespaces appear correctly in the completions dropdown with "Network namespace" descriptions.

Note: The completions trigger with the short form -n but not the long form -netns, which appears to be a limitation of how Warp's completion parser handles single-dash multi-character flags. The generator itself works correctly.