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>

docs/CLI-REFERENCE.md

@@ -6,15 +6,15 @@ Three CLI modules, one per Ready tool:
 
 | Module | Command | Purpose |
 |--------|---------|---------|
-| `src.cli` | `python -m src.cli FILE` | Deduplicator |
-| `src.cli_text_clean` | `python -m src.cli_text_clean FILE` | Text Cleaner |
+| `src.cli` | `python -m src.cli FILE` | Find Duplicates |
+| `src.cli_text_clean` | `python -m src.cli_text_clean FILE` | Clean Text |
 | `src.cli_analyze` | `python -m src.cli_analyze FILE` | Analyzer (read-only scan) |
 
 Every command is **preview-only by default** — add `--apply` to write output.
 
 ---
 
-# Deduplicator
+# Find Duplicates
 
 ```
 python -m src.cli INPUT_FILE [OPTIONS]
@@ -123,7 +123,7 @@ Log: `logs/dedup_YYYYMMDD_HHMMSS.log`.
 
 ---
 
-# Text Cleaner
+# Clean Text
 
 ```
 python -m src.cli_text_clean INPUT_FILE [OPTIONS]
@@ -154,7 +154,7 @@ Character-level hygiene. See [TECHNICAL.md §10.2](TECHNICAL.md) for the spec.
 - `--config PATH` / `--save-config PATH`.
 
 ### File
-- `--sheet`, `--encoding`, `--header-row` — same as Deduplicator.
+- `--sheet`, `--encoding`, `--header-row` — same as Find Duplicates.
 
 ## Presets