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>

tests/gui/test_lite_tier.py

@@ -1,9 +1,9 @@
 """GUI tests for the Lite tier.
 
-A Lite license unlocks Deduplicator, Text Cleaner, Format
-Standardizer. Opening any other tool page (Missing Values, Column
-Mapper, Pipeline Runner, etc.) must render an upgrade prompt and
-short-circuit the page body.
+A Lite license unlocks Find Duplicates, Clean Text, Standardize
+Formats. Opening any other tool page (Fix Missing Values, Map
+Columns, Automated Workflows, etc.) must render an upgrade prompt
+and short-circuit the page body.
 
 The home grid shows a 🔒 Locked badge on the cards for tools the
 user's tier doesn't unlock.
@@ -104,7 +104,7 @@ class TestLiteHomeGridBadges:
     ):
         home_app.run()
         text = collected_text(home_app)
-        # Missing Value Handler is locked under Lite — its card should
+        # Fix Missing Values is locked under Lite — its card should
         # have a 🔒 Locked badge.
         # We assert the lock glyph appears alongside the locked tool's
         # display name. Streamlit renders the markdown verbatim so the