chore(ci): batch release-please daily — drop the per-push trigger (#13)

## Summary

Fleet git/PR-friction sweep (2026-07-26, mirrors merged practice from
anders-config#584): drop `release-please.yml`'s `push` trigger; no
schedule existed, so a staggered daily cron (`17 6 * * *`) is added
alongside the kept `workflow_dispatch`. **This is the template repo —
every future repo created from it inherits the daily cadence instead of
the per-push churn.** Versioning unchanged; reverting is one line,
documented in the workflow header.

## Risk

Low; trigger-only change; YAML verified parsing with triggers exactly
{schedule, workflow_dispatch}.

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https://claude.ai/code/session_01RMgdMuw1YhNnEAffnp9wEQ

---
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: sterngold

.github/workflows/release-please.yml

@@ -1,9 +1,16 @@
 name: release-please
 
+# No `push` trigger, deliberately (fleet git/PR-friction sweep, 2026-07-26):
+# per-push release PRs self-merged all day and kept moving main's tip, which
+# made every open PR go stale between fetch and merge. One daily cron cut
+# (plus manual dispatch for urgent releases) keeps versioning identical —
+# release-please accumulates the conventional commits since the last release.
+# Reverting is one line: put `push: {branches: [main]}` back under `on:`.
+# (Template repo: every repo created from this inherits the daily cadence.)
 on:
-  push:
-    branches: [main]
   workflow_dispatch:
+  schedule:
+    - cron: '17 6 * * *'
 
 permissions:
   contents: write