fix(tests): repair extension summary assertion in doctor diagnostics test

[yasinBursali]

What

Replaces the order-dependent regex in tests/test-doctor-extension-diagnostics.sh test #9 ("Extension summary output present") with two order-independent chained greps.

Why

The existing assertion

grep -q "ext_total.*ext_healthy" "$ROOT_DIR/scripts/dream-doctor.sh"

requires ext_total to appear first on the matched line. But scripts/dream-doctor.sh:364 emits

print(f"  Extensions:    {ext_healthy}/{ext_total} healthy, {ext_issues} with issues")

— ext_healthy comes first. The grep has been permanently failing since the format was introduced; test #9 has been broken on every branch that inherits from main.

How

Switches to the chained-grep idiom already used elsewhere in the same file (test #7, lines 74–80, which checks for extensions_total, extensions_healthy, and extensions_issues):

if grep -q "ext_total" "$ROOT_DIR/scripts/dream-doctor.sh" && \
   grep -q "ext_healthy" "$ROOT_DIR/scripts/dream-doctor.sh"; then

Order-independent and future-proof against either variable being reordered in the print statement.

Testing

• bash -n tests/test-doctor-extension-diagnostics.sh — clean
• shellcheck tests/test-doctor-extension-diagnostics.sh — no new warnings
• bash tests/test-doctor-extension-diagnostics.sh — all 9 tests pass (was 8/9 before this change)
• Pre-commit (gitleaks / private-key / large-file) — clean

Platform Impact

• macOS: passes
• Linux: passes (CI runs on Ubuntu — confirmed via identical bash+grep semantics)
• Windows (WSL2): not exercised — tests are Linux/macOS only