Run prettier across the repo, exclude the lockfile from it

Prettier had never been run in --check mode here before, so this had
drifted across most files (markdown tables, long option() chains,
line wrapping). Purely formatting, no logic changes - needed so a CI
format:check gate can actually pass. Adds .prettierignore for
pnpm-lock.yaml specifically: prettier's YAML formatter rewrites every
quoted key (single -> double quotes) producing an ~8700-line diff of
pure noise on a file pnpm itself owns the formatting of.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

examples/triggershell.yml

@@ -72,7 +72,7 @@ scripts:
         label: Notify Slack Channel
         type: string
         required: false
-        pattern: '^#[a-z0-9-]+$'
+        pattern: "^#[a-z0-9-]+$"
         passAs: env
         envName: SLACK_CHANNEL