Revert "docs: add v1.1.0 frontmatter documentation and split spec (#2)"

This reverts commit 1900232.

Author: ricksaarge

AGENTS.md

@@ -149,23 +149,6 @@ taskmark-spec/
 
 **Invalid Date Handling:** Warn at `file:line`, ignore field, continue parsing
 
-### YAML Front Matter
-
-**Supported Fields:**
-
-| Field | Purpose | Example |
-|-------|---------|---------|
-| `locale` | Natural language date parsing + default output format | `en_US`, `fr_FR` |
-| `timezone` | Default timezone for dates without explicit timezone | `America/New_York`, `UTC` |
-| `date_format` | Output date format (strftime), overrides locale | `%Y-%m-%d`, `%d/%m/%Y` |
-
-**File Scope Rules:**
-
-- Front matter applies ONLY to the current file
-- Linked files retain their own front matter
-- No inheritance of front matter between files
-- Default: system locale/timezone, ISO 8601 output (`YYYY-MM-DD`)
-
 ### Section Headers and Inheritance
 
 ```markdown

TODO.md

@@ -2,6 +2,25 @@
 
 Project roadmap and tasks for the TaskMark specification.
 
+## v1.1.0 - Frontmatter Enhancements +taskmark-spec/v1.1.0 #documentation
+
+### Locale and Date Handling
+
+- [ ] Document `locale` frontmatter field ~2h
+  - Used for parsing natural language dates and recurrence patterns
+  - When set (without `date_format`), output uses locale's default date format instead of ISO
+- [ ] Document `date_format` frontmatter field ~1h
+  - Accepts strftime patterns (e.g., `%d/%m/%Y`)
+  - Overrides locale default format when both are set
+- [ ] Document that default output format is ISO 8601 (`YYYY-MM-DD`) when no locale/date_format set ~30m
+
+### File-Scoped Frontmatter
+
+- [ ] Document that `timezone` only applies to the current file ~30m
+- [ ] Document that `locale` only applies to the current file ~30m
+- [ ] Document that `date_format` only applies to the current file ~30m
+- [ ] Document that imported files retain their own frontmatter settings ~1h
+
 ## v1.2.0 - Documentation Updates +taskmark-spec/v1.2.0 #documentation
 
 - [ ] Document `@user` assignees in headers for inheritance ~1h