fix: add title-tag theme support for proper <title> output (v1.0.2)

Co-Authored-By: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -34,7 +34,7 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 
 **Note for AI Assistants:** Clean this section after the specific features are done or new releases are made. Effective changes are tracked in `CHANGELOG.md`. Do not add completed versions here - document them in the Session History section at the end of this file.
 
-Current version is **v1.0.1**. See `PLAN.md` for details.
+Current version is **v1.0.2**. See `PLAN.md` for details.
 
 ## Technical Stack
 
@@ -193,6 +193,28 @@ Build steps (in order):
 
 ## Session History
 
+### Session 10 — v1.0.2 Title Tag Fix (2026-02-10)
+
+**Completed:** Fixed missing HTML `<title>` tag on all pages rendered by the theme's Twig pipeline.
+
+**What was fixed:**
+
+- Added `add_theme_support('title-tag')` to `wp_bootstrap_setup()` in `functions.php`
+
+**Root cause:**
+
+- The theme's `base.html.twig` calls `{{ wp_head() }}` which fires the `wp_head` action
+- WordPress hooks `_wp_render_title_tag()` to `wp_head` at priority 1, which outputs the `<title>` tag
+- However, this hook only fires when the theme declares `add_theme_support('title-tag')`
+- The theme never made this declaration, so `wp_head()` output included styles and scripts but no `<title>` element
+- All pages rendered by `TemplateController` (via `base.html.twig`) were affected
+
+**Key learnings:**
+
+- `add_theme_support('title-tag')` is required even for themes that render `wp_head()` via Twig — WordPress does not output `<title>` without it
+- The absence of a `<title>` tag is invisible in the rendered page but affects SEO, browser tab display, and bookmarking
+- This support declaration has been standard since WordPress 4.1 and should always be included in `after_setup_theme`
+
 ### Session 9 — v1.0.1 Bootstrap Icons (2026-02-09)
 
 **Completed:** Bootstrap Icons web font integration via SCSS build pipeline.