feat: makefile: add smoke test target and standardize output symbols

Smoke Test Target:
- Add SMOKE_TESTS variable matching test-*-smoke.el pattern
- Create test-smoke target that runs before unit/integration tests
- Implement fail-fast behavior: smoke test failures stop further execution
- Update test execution order: smoke → unit → integration (testing pyramid)
- Fix INTEGRATION_TESTS pattern to match test-*-integration-*.el
- Update help text with correct test counts for each category

Symbol Standardization:
- Replace Unicode symbols with bracketed ASCII for better portability
  - ✓ → [✓] (success/completion)
  - ✗ → [✗] (error/failure)
  - ⚠ → [!] (warning/attention)
- Apply to all targets: test, validate, compile, lint, install-deps, clean
- No color codes (were never present)
- Benefits: works in all terminals, easier to grep/parse

Test organization now:
- 1 smoke test file (package sanity checks - runs first)
- 16 unit test files (function behavior)
- 1 integration test file (component interactions)

0 files changed, 0 insertions, 0 deletions