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_workflows.py

@@ -19,7 +19,7 @@ from .conftest import collected_text, stash_upload
 
 
 # ---------------------------------------------------------------------------
-# Deduplicator
+# Find Duplicates
 # ---------------------------------------------------------------------------
 
 class TestDeduplicatorWorkflow:
@@ -64,7 +64,7 @@ class TestDeduplicatorWorkflow:
 
 
 # ---------------------------------------------------------------------------
-# Text Cleaner
+# Clean Text
 # ---------------------------------------------------------------------------
 
 class TestTextCleanerWorkflow:
@@ -96,7 +96,7 @@ class TestTextCleanerWorkflow:
 
 
 # ---------------------------------------------------------------------------
-# Format Standardizer
+# Standardize Formats
 # ---------------------------------------------------------------------------
 
 class TestFormatStandardizerWorkflow:
@@ -110,7 +110,7 @@ class TestFormatStandardizerWorkflow:
 
 
 # ---------------------------------------------------------------------------
-# Missing Value Handler
+# Fix Missing Values
 # ---------------------------------------------------------------------------
 
 class TestMissingValuesWorkflow:
@@ -124,7 +124,7 @@ class TestMissingValuesWorkflow:
 
 
 # ---------------------------------------------------------------------------
-# Column Mapper
+# Map Columns
 # ---------------------------------------------------------------------------
 
 class TestColumnMapperWorkflow:
@@ -138,7 +138,7 @@ class TestColumnMapperWorkflow:
 
 
 # ---------------------------------------------------------------------------
-# Pipeline Runner
+# Automated Workflows
 # ---------------------------------------------------------------------------
 
 class TestPipelineRunnerWorkflow: