Live check health and stop endpoints

[jerbly]

• New feature (#1153) - Live-check now has a /health endpoint that can be used in long-running scenarios to confirm readiness and liveness of the live-check server.
• New feature (#1100) - Set --output=http to have live-check send its report as the response to /stop.

[codecov]

Codecov Report

❌ Patch coverage is 77.27273% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.9%. Comparing base (720c984) to head (5c01a61).

Files with missing lines	Patch %	Lines
crates/weaver_forge/src/lib.rs	71.6%	15 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1193     +/-   ##
=======================================
- Coverage   80.0%   79.9%   -0.1%     
=======================================
  Files        109     109             
  Lines       8528    8586     +58     
=======================================
+ Hits        6823    6868     +45     
- Misses      1705    1718     +13     

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