Add per-command CLI telemetry

[FarazPatankar]

Summary

• Adds per-command telemetry that sends a cliEventTrack GraphQL mutation after each CLI invocation
• Tracks command name, subcommand, duration, success/error (truncated to 256 chars), OS, arch, CLI version, and CI flag
• User identity comes from existing auth headers — silently skipped when unauthenticated
• Opt out via DO_NOT_TRACK=1 (follows consoledonottrack.com convention)
• Updates schema.json with latest from the API

Files changed

File	Change
src/telemetry.rs	New module — CliTrackEvent struct and async send() function
src/main.rs	mod telemetry; declaration
src/macros.rs	Wrap command dispatch with timing + telemetry call
src/gql/mutations/strings/CliEventTrack.graphql	New mutation definition
src/gql/mutations/mod.rs	Register CliEventTrack struct, add DNS_RECORD_TYPE_TXT variant from schema update
src/gql/schema.json	Updated from API

Design decisions

• Typed graphql_client codegen — uses post_graphql::<mutations::CliEventTrack, _>(), matching the rest of the codebase
• 3-second timeout via tokio::time::timeout prevents stalling on exit
• Awaited (not spawned) — ensures telemetry completes before process exit, including after interactive commands
• No new dependencies — uses existing graphql_client, reqwest (via GQLClient), and tokio

Test plan

• cargo build compiles cleanly
• cargo test — all 106 tests pass
• cargo clippy — no new warnings
• RUST_LOG=reqwest=debug cargo run -- whoami — confirm telemetry POST fires
• DO_NOT_TRACK=1 cargo run -- whoami — confirm no telemetry POST
• cargo run -- link (interactive) — confirm telemetry fires after prompt completion
• cargo run -- login (unauthenticated) — confirm no crash, telemetry silently skipped