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>

landing/index.html

@@ -168,9 +168,9 @@
     <h2>One engine. Same six tools. Same $49.</h2>
     <p>
       The persona pages above are positioning, not different products.
-      Whichever you buy, you get the full bundle: Deduplicator, Text
-      Cleaner, Format Standardizer, Missing-Value Handler, Column
-      Mapper, and Pipeline Runner — pre-tuned with a saved pipeline
+      Whichever you buy, you get the full bundle: Find Duplicates, Clean
+      Text, Standardize Formats, Fix Missing Values, Map Columns,
+      and Automated Workflows — pre-tuned with a saved pipeline
       that matches your workflow.
     </p>
     <div class="grid">