fix: mark Lead agents in handle_status so CLI filters them from coworker list

[btucker]

Summary

midtown status was listing the project lead and topic-channel leads in the Coworkers section alongside actual workers. Discovered while dogfooding the lead → task → worker → PR → merge flow.

Coworkers
─────────────────────────────
btucker-reviewer running  -
midtown          running  -      ← project lead, should be filtered
ink-blot         running  !1 ...
ops              running  -      ← channel lead, should be filtered
tool-echo        running  !2 ...

Root cause

handle_status in src/daemon_v2/rpc/handlers.rs emits coworker_type: "lead" (a string label) for each running agent, but the CLI's Response::Coworkers deserializer (CoworkerInfo) reads is_channel_lead (a bool flag) — different field names. With #[serde(default)] on is_channel_lead, the flag silently defaulted to false for every agent, so the display formatter's !cw.is_channel_lead filter never excluded leads.

The companion handle_agent_list does the right thing because it emits the kind field that the CLI also recognizes — that's why midtown agent list correctly classifies agents while midtown status doesn't.

Fix

One field added to the handle_status coworker JSON:

"is_channel_lead": matches!(a.kind, AgentKind::Lead),

Both project leads (midtown-project-lead) and topic-channel leads (midtown-channel-lead) are AgentKind::Lead, so a single check covers both.

Test plan

• New regression test handle_status_marks_lead_coworkers_as_channel_leads in src/daemon_v2/rpc/rpc_tests.rs — builds a Projections with one running worker, one running project lead, and one running topic-channel lead; asserts the worker has is_channel_lead=false and both leads have is_channel_lead=true. Confirmed failing on the unfixed code (`Null` in place of the bool), passing after the fix.
• All 1537 lib tests pass
• Discovered via dogfood: `midtown status` listed `midtown` and `ops` in the Coworkers section. After fix, only actual workers appear.

🌃 Co-built with Midtown

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.95%. Comparing base (05897b0) to head (10c05d9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2332      +/-   ##
==========================================
+ Coverage   63.70%   63.95%   +0.25%     
==========================================
  Files         100      100              
  Lines       38582    38592      +10     
==========================================
+ Hits        24578    24683     +105     
+ Misses      14004    13909      -95     

Files with missing lines	Coverage Δ
src/daemon_v2/rpc/handlers.rs	86.73% <100.00%> (+0.02%)	⬆️

... and 8 files with indirect coverage changes

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