fix(kyberforge): fix bats SCRIPT path and clarify test helper install location

Both validate.bats and new-skill.bats constructed SCRIPT using
$(dirname "$BATS_TEST_FILENAME"), which resolves to tests/ — causing
every test to fail with file-not-found. Fixed to use
$BATS_TEST_DIRNAME/../scripts/ to reach the actual scripts/ directory.

Also clarifies that bats-support/bats-assert must be installed from the
repo root (not the skill root) to match where the tests load them from,
and adds text language tags to three output-template code blocks in
skill-audit's SKILL.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/skills/skill-audit/SKILL.md

@@ -97,7 +97,7 @@ Check each pattern is appropriate and correctly formed:
 
 Open with a coverage line listing every dimension checked:
 
-```
+```text
 Checked: structure · description · body-discipline · patterns · file-structure · formatting · scripts · internal-consistency
 ```
 
@@ -105,7 +105,7 @@ Then output only dimensions that have findings, grouped under H3 headings, FAILs
 
 For each finding:
 
-```
+```text
 FAIL/SUGGESTION  <finding> — file:line
                  Why: <why this is a problem>
                  Fix: <exact change — quote before/after where applicable>
@@ -113,7 +113,7 @@ FAIL/SUGGESTION  <finding> — file:line
 
 Close with a result block:
 
-```
+```text
 ## Result
 
 PASS / PASS (N suggestions) / FAIL (N fails · M suggestions)