Add explicit event filters to install/lint/typecheck steps

Woodpecker's linter flags steps with no event filter as a "bad habit" (they'd
otherwise run on every event type, including ones added to Woodpecker in the
future). Scoped to [push, deployment] specifically — not just push — since a
production deploy re-runs the whole pipeline as a deployment event, and
deploy-production's build needs these steps (especially install's node_modules)
to have actually run first.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017DUU6CnxECCDeqDNYJgr5x

.woodpecker.yml

@@ -14,18 +14,29 @@
 # `npm ci` in the install step is enough for every later step to reuse.
 
 steps:
+  # Explicit event filter on these three (rather than the no-`when` default,
+  # which runs on every event Woodpecker knows about) because a deploy-time
+  # re-run of this pipeline is a `deployment` event, not `push` — install
+  # has to fire there too, or deploy-production's `npm run build` would run
+  # with no node_modules.
   - name: install
     image: node:22-bookworm
+    when:
+      - event: [push, deployment]
     commands:
       - npm ci
 
   - name: lint
     image: node:22-bookworm
+    when:
+      - event: [push, deployment]
     commands:
       - npm run lint
 
   - name: typecheck
     image: node:22-bookworm
+    when:
+      - event: [push, deployment]
     commands:
       - npx tsc -b