fix(ci): the BoJ trigger has never been a valid workflow (#74)

`⚙ Auto: BoJ server build trigger` has **failed every run it has ever
had**, producing zero jobs and no log each time.

## Cause

```yaml
if: ${{ vars.BOJ_SERVER_URL != '' || secrets.BOJ_SERVER_URL != '' }}
```

GitHub rejects this outright:

```
Invalid workflow file: Unrecognized named-value: 'secrets'.
Located at position 30 within expression:
vars.BOJ_SERVER_URL != '' || secrets.BOJ_SERVER_URL != ''
```

The **`secrets` context is not available in a job-level `if:`** — only
in `env:`, `with:`, `run:`, and reusable-workflow inputs. So the file
has never been a valid workflow, and the run dies during expression
evaluation *before any job exists*. That is why it leaves no log and no
check run: there is nothing to log.

## Why deleting the guard is the right fix

It was redundant as well as broken. The step already does the same job
correctly:

```yaml
env:
  BOJ_URL: ${{ secrets.BOJ_SERVER_URL || vars.BOJ_SERVER_URL }}   # legal here
run: |
  if [ -z "$BOJ_URL" ]; then
    echo "BOJ_SERVER_URL not configured - skipping"; exit 0
  fi
```

Removing the broken guard restores exactly the intended behaviour: a
clean skip when the server is not configured.

**A note on the alternative.** `lithoglyph` was already cured
differently — by narrowing the guard to `if: ${{ vars.BOJ_SERVER_URL !=
'' }}`. That is valid, and its runs now show `skipped` rather than
`failure`, which is how this diagnosis was confirmed against a control.
But it silently breaks **secret-only** configuration, which this
workflow's own header explicitly supports ("set `BOJ_SERVER_URL` as a
repository secret **or** variable"). Deleting the guard honours the
documented contract; narrowing it does not.

## Scope

**51 repositories carry the identical broken line**, so 51 default
branches have been permanently red on a workflow that has never once
executed. This PR is one of that set.

Because the workflow has never been valid, **this change cannot regress
anything** — there is no working behaviour to lose.

Found during the 2026-08-05 estate CI/CD census.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/boj-build.yml

@@ -15,7 +15,6 @@ jobs:
   trigger-boj:
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    if: ${{ vars.BOJ_SERVER_URL != '' || secrets.BOJ_SERVER_URL != '' }}
     steps:
       - name: Checkout
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7