refactor(tests): consolidate graphify Module — 7 files → 1 (#3769)

* refactor(tests): consolidate graphify Module — 7 files → 1

Closes #3761

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

* refactor(tests): split graphify.test.cjs along describe-block seams — keep files ≤ 800 LOC

- tests/graphify.test.cjs (653 LOC): status + build
- tests/graphify-query.test.cjs (447 LOC): query
- tests/graphify-visualization.test.cjs (577 LOC): staleness + mvp-viz + regressions
- tests/graphify-auto-update.test.cjs (625 LOC): auto-update hook
- tests/helpers/graphify.cjs (112 LOC): shared helpers extracted

Total: 132 tests, 0 failures. Refs #3761.

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

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

.changeset/3761-consolidate-graphify-tests.md

@@ -0,0 +1,7 @@
+---
+type: Fixed
+pr: 3762
+---
+<!-- docs-exempt: internal test refactor — no user-facing behavior changed -->
+
+**Consolidate graphify Module tests — 7 files → 1 (#3761)** — collapses the test-as-changelog anti-pattern where each PR (`enh-3170`, `bug-3166`, `feat-3347-config`, `feat-3347-hook`, `bug-3579`) added a new standalone file instead of appending to the existing `graphify.test.cjs`. All 131 tests (plus one new counter-test for mvp-viz non-mvp path) are now in a single file organized into describe blocks by surface: `status`, `build`, `query`, `staleness`, `mvp-viz`, `auto-update`, `regressions`. Issue-stamped tests carry `// Regression for #NNNN` comments. Adds Knowledge Graph Module glossary entry to `CONTEXT.md`.