feat: team CRUD and membership management

[lightstrike]

Summary

• Add full team CRUD to the CLI: teams read, teams create, teams update, teams delete
• Add team membership management: teams members add, teams members remove
• Generate 5 new SDK mutation functions via codegen: team_create, team_update, team_delete, team_membership_create, team_membership_delete
• Update usage command reference with all new team commands

Details

Teams previously only supported teams list. This PR brings teams to feature parity with documents and projects:

CLI commands added:

• teams read <KEY-OR-ID> — full detail view including members, cycles/triage settings
• teams create <NAME> — with --key, --description, --icon, --color, --timezone, --private, --cycles-enabled, --triage-enabled
• teams update <KEY-OR-ID> — same flags as create plus --name, with no-op validation
• teams delete <KEY-OR-ID> — accepts key, name, or UUID
• teams members add <TEAM> --user <USER> — add a user (supports me alias)
• teams members remove <TEAM> --user <USER> — resolves membership ID internally, then removes

Implementation notes:

• Follows the existing document/project patterns: lean types (TeamRef, TeamDetail, TeamMembershipRef), resolve_team_id reuse, print_one/print_table output
• members remove does a two-step lookup: fetches team memberships to find the TeamMembership ID for the target user, then calls team_membership_delete
• No-op update validation matches the documents/milestones pattern

Test plan

• SDK offline: 5 mutation variable serialization tests (team create, update, delete, membership create, membership delete)
• SDK online: 2 integration tests (team CRUD lifecycle, membership create/delete lifecycle)
• CLI offline: 10 tests (help text for all subcommands, flag validation, no-op update error, --user required, usage text)
• CLI online: 3 end-to-end tests (create + list + delete, full CRUD with read-back verification, members add + verify + remove)
• make check passes (fmt, clippy, doc, build)
• make test passes (all 73 CLI offline, 44 SDK offline, 0 warnings)

[flipbit03]

Hey! The online tests are failing because Linear has a 48-character limit on team names, and the test names with a full UUID exceed that:

[test] CLI teams create 3acf27ab-5a19-46e2-abc8-324447a9c890   → 62 chars
[test] CLI teams CRUD 9b802ecb-4f5b-412e-897d-23435a7cfc3b     → 59 chars
[test] CLI teams members 2e1d24bd-8a3a-4527-a622-f4ad4035fa09   → 62 chars

Fix is to truncate the UUID to its first 8 chars — that keeps names well under the limit:

// Before:
let unique_name = format!("[test] CLI teams create {}", uuid::Uuid::new_v4());

// After:
let unique_name = format!("[test] tm-create {}", &uuid::Uuid::new_v4().to_string()[..8]);

Same change for the other two tests (tm-crud, tm-members). Three lines total.

I tried pushing the fix directly to your branch but ran into permission issues — would you mind applying this?

[lightstrike]

@flipbit03 Changes made and also rebased to resolve conflicts from the comments delete PR merged (thanks!)

[flipbit03]

@lightstrike we also need to fix those documentation lints. that < needs proper escaping to appear in Rustdoc

[lightstrike]

@flipbit03 It looks like one of the online tests failed -- I'll open up a fix in a new PR once I get it figured out.

[lightstrike]

@flipbit03 Does your test Linear account have multiple users?

[lightstrike]

Basically we can't really test adding and removing a member without a second user account because the creator of the team is auto-added.

[flipbit03]

@lightstrike I noticed that behavior, when testing, and created a second test user in the Linear Workspace I have set up for this:

I'm now looking into improving the currently existing team membership crud tests, as I already merged this PR, I'll be tackling that in a further PR. Thanks again for the contributions! Here's the issue for it:

• fix: team membership tests should dynamically resolve users instead of using 'me' #100

EDIT: This is fixed now, and these tests are now fully utilizing the second user to exercise the happy path. Cheers!