docs+code: rename tool labels everywhere

Sweep follow-up to 93e43fc. Display labels now consistent across docs,
landing pages, CLI output, code comments, docstrings, and test prose.
Five parallel surfaces touched:

- docs (EN + ES): README, USER-GUIDE, CLI-REFERENCE, and 11 internal
  design/planning docs
- landing pages: index + bookkeeper/revops/shopify-pet
- src: CLI module docstrings, _TOOL_DISPLAY dicts in cli_analyze.py
  and gui/components/_legacy.py, core module headers, every tool
  page's module docstring
- tests: class/method/module docstrings and section-header comments
- test-cases READMEs

Page slugs (1_Deduplicator etc.), tool_id strings (01_deduplicator
etc.), Python class names (TestDeduplicatorWorkflow, FeatureFlag.*),
URL paths, anchor IDs, CSS classes, and asset filenames were left
intact since they're code identifiers / structural references.

All 2033 tests pass.

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

build/README.md

@@ -246,7 +246,7 @@ much state to trust:
 4. Double-click the app icon.
 5. Browser should open to http://127.0.0.1:850x within 5 seconds.
 6. Drop samples/demo/shopify_pet_customers.csv into the
-   Pipeline Runner page; click Run; AFTER preview should appear.
+   Automated Workflows page; click Run; AFTER preview should appear.
 7. Confirm in the network tab: zero outbound calls except to
    127.0.0.1 and the Streamlit static asset paths (also local).
 ```