chore(harness): fix knip drift signal and drift-to-issue trigger

Two fixes after the first Harness run on main surfaced design bugs:

1. drift-to-issue.yml never fires. Its `if:
   github.event.workflow_run.conclusion == 'failure'` guard is
   unreachable, because Harness jobs set `continue-on-error: true`,
   which makes the workflow conclude `success` even when individual
   sensors fail. Drop the workflow-level guard and rely on the
   job-level conclusion loop already inside the Python script — jobs
   that pass are a silent no-op.

2. knip noise drowned the real signal. Add knip.json that:
   - Registers SearchModal.svelte as an entry point (loaded via
     dynamic `await import()` from docs/+layout.svelte, which knip's
     static analysis can't see).
   - Ignores `@cloudflare/workers-types` as a type-only transitive
     pulled in by @sveltejs/adapter-cloudflare.
   - Disables the noisy "unused exports / types / namespace members"
     rules (these flag internal API surface and rarely yield real work).

With the filter in place, knip surfaced real drift: codemirror and
svelte-codemirror-editor were declared but never imported; the raw
@codemirror/{view,state,commands} were imported by ShellEditor.svelte
but not declared in package.json (working only via transitive
resolution); @testing-library/svelte was a devDep with no callers.
Removed the unused, added the missing — knip exits clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: fullstackjam

.github/workflows/drift-to-issue.yml

@@ -22,7 +22,10 @@ permissions:
 
 jobs:
   open-or-update-issue:
-    if: github.event.workflow_run.conclusion == 'failure'
+    # No workflow-level conclusion check: Harness jobs use
+    # `continue-on-error: true`, which means the workflow itself concludes
+    # `success` even when individual sensors fail. We inspect job-level
+    # conclusions inside the Python loop below — jobs that pass are a no-op.
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

knip.json

@@ -0,0 +1,15 @@
+{
+	"$schema": "https://unpkg.com/knip@5/schema.json",
+	"entry": ["src/lib/components/SearchModal.svelte!"],
+	"ignoreDependencies": ["@cloudflare/workers-types"],
+	"rules": {
+		"exports": "off",
+		"types": "off",
+		"nsExports": "off",
+		"nsTypes": "off",
+		"enumMembers": "off",
+		"classMembers": "off",
+		"duplicates": "off",
+		"binaries": "off"
+	}
+}