docs: api comments say what the endpoints do, not how they came to be (#6277)

Rewrites the internal/api comment blocks to rule 32: task, milestone and
rule ids gone, the stories behind them restated as the constraint they
left, stale references corrected (the stream secret is wired from config,
the timezone handler already refreshes the scheduler, the Android app is
the native client, the design docs cited are not in the repo). Also
rewraps comment lines over 80 columns left by the earlier batches.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/events_publish.go

@@ -1,7 +1,7 @@
-// Small helpers for posting live events to the SSE bus (#392). Producers
-// call these from their handler success paths so the wire shape stays in
-// one place. Each helper is a no-op when h.eventbus is nil (older callers
-// or tests that don't construct a bus); production always has one.
+// Small helpers for posting live events to the SSE bus. Producers call
+// these from their handler success paths so the wire shape stays in one
+// place. Each helper is a no-op when h.eventbus is nil (tests that don't
+// construct a bus); production always has one.
 
 package api