Follow-up to cache-first registration (c95ec04). The cold-cache wall
clock is now bounded by the slowest individual plugin, not the sum:
- Fan out HTTP and stdio discovery together in goroutines rather than
running the stdio loop serially after HTTP.
- HTTP cold budget: 4s → 700ms (auth) / 500ms (plain). Honest dial
timeouts on unreachable endpoints fail fast; healthy third-party
endpoints respond well under the window. The outcome is still saved
as a negative cache, so a miss this run costs the next run ~0ms.
- Stdio cold budget: 4s → 1s. A local subprocess handshake is milliseconds.
With three user plugins (one pointing at TEST-NET-1, permanently
unreachable), cold `dws --help` drops from ~3.3s to ~0.8s and warm stays
at ~80ms. The savings compound linearly with plugin count.
修雨
daf56514f7