phase 3 (branch): foundational FSE templates (no flip yet)

Add templates/{page,single,archive,search,404}.html — compose the header/footer
parts + standard blocks (post-title/post-content, query loop, comments), modeled
on the srh reference but simplified to daw's aesthetic. Correct footer part per
template (single/search/page -> footer; archive/404 -> footer-home).

Deliberately NO templates/index.html yet, so wp_is_block_theme() stays false and
the site remains classic/unflipped. All five parse with no unregistered blocks.
Next: bespoke page templates, then add index.html to flip + test.

templates/404.html

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+<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
+
+<!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} -->
+<main class="wp-block-group">
+	<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+	<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)">
+		<!-- wp:heading {"level":1} -->
+		<h1 class="wp-block-heading">Not found</h1>
+		<!-- /wp:heading -->
+		<!-- wp:paragraph -->
+		<p>That page doesn't exist. Try a search, or head <a href="/">home</a>.</p>
+		<!-- /wp:paragraph -->
+		<!-- wp:search {"label":"Search","buttonText":"Search"} /-->
+	</div>
+	<!-- /wp:group -->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer-home","tagName":"footer"} /-->

templates/archive.html

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+<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
+
+<!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} -->
+<main class="wp-block-group">
+	<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+	<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)">
+		<!-- wp:query-title {"type":"archive","level":1} /-->
+		<!-- wp:term-description /-->
+		<!-- wp:query {"queryId":0,"query":{"inherit":true,"perPage":10},"layout":{"type":"constrained"}} -->
+		<div class="wp-block-query">
+			<!-- wp:post-template -->
+			<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|40","bottom":"var:preset|spacing|40"}}},"layout":{"type":"constrained"}} -->
+			<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40)">
+				<!-- wp:post-title {"level":2,"isLink":true} /-->
+				<!-- wp:post-date {"fontSize":"x-small"} /-->
+				<!-- wp:post-excerpt /-->
+			</div>
+			<!-- /wp:group -->
+			<!-- /wp:post-template -->
+			<!-- wp:query-pagination {"layout":{"type":"flex","justifyContent":"center"}} -->
+			<!-- wp:query-pagination-previous /-->
+			<!-- wp:query-pagination-numbers /-->
+			<!-- wp:query-pagination-next /-->
+			<!-- /wp:query-pagination -->
+			<!-- wp:query-no-results -->
+			<!-- wp:paragraph -->
+			<p>Nothing found.</p>
+			<!-- /wp:paragraph -->
+			<!-- /wp:query-no-results -->
+		</div>
+		<!-- /wp:query -->
+	</div>
+	<!-- /wp:group -->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer-home","tagName":"footer"} /-->

templates/page.html

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+<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
+
+<!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} -->
+<main class="wp-block-group">
+	<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+	<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)">
+		<!-- wp:post-title {"level":1} /-->
+		<!-- wp:post-content {"layout":{"type":"constrained"}} /-->
+	</div>
+	<!-- /wp:group -->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer","tagName":"footer"} /-->

templates/search.html

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+<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
+
+<!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} -->
+<main class="wp-block-group">
+	<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+	<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)">
+		<!-- wp:query-title {"type":"search","level":1} /-->
+		<!-- wp:search {"label":"Search","buttonText":"Search"} /-->
+		<!-- wp:query {"queryId":0,"query":{"inherit":true,"perPage":10},"layout":{"type":"constrained"}} -->
+		<div class="wp-block-query">
+			<!-- wp:post-template -->
+			<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|40","bottom":"var:preset|spacing|40"}}},"layout":{"type":"constrained"}} -->
+			<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40)">
+				<!-- wp:post-title {"level":2,"isLink":true} /-->
+				<!-- wp:post-excerpt /-->
+			</div>
+			<!-- /wp:group -->
+			<!-- /wp:post-template -->
+			<!-- wp:query-pagination {"layout":{"type":"flex","justifyContent":"center"}} -->
+			<!-- wp:query-pagination-previous /-->
+			<!-- wp:query-pagination-numbers /-->
+			<!-- wp:query-pagination-next /-->
+			<!-- /wp:query-pagination -->
+			<!-- wp:query-no-results -->
+			<!-- wp:paragraph -->
+			<p>Nothing matched your search. Try different keywords.</p>
+			<!-- /wp:paragraph -->
+			<!-- /wp:query-no-results -->
+		</div>
+		<!-- /wp:query -->
+	</div>
+	<!-- /wp:group -->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer","tagName":"footer"} /-->

templates/single.html

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+<!-- wp:template-part {"slug":"header","tagName":"header"} /-->
+
+<!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} -->
+<main class="wp-block-group">
+	<!-- wp:group {"style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60"}}},"layout":{"type":"constrained"}} -->
+	<div class="wp-block-group" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)">
+		<!-- wp:post-title {"level":1} /-->
+		<!-- wp:group {"style":{"spacing":{"margin":{"bottom":"var:preset|spacing|40"}}},"layout":{"type":"flex","flexWrap":"nowrap"}} -->
+		<div class="wp-block-group" style="margin-bottom:var(--wp--preset--spacing--40)">
+			<!-- wp:post-date {"fontSize":"x-small"} /-->
+			<!-- wp:post-terms {"term":"category","fontSize":"x-small"} /-->
+		</div>
+		<!-- /wp:group -->
+		<!-- wp:post-content {"layout":{"type":"constrained"}} /-->
+		<!-- wp:post-terms {"term":"post_tag","prefix":"Tagged: ","fontSize":"x-small"} /-->
+		<!-- wp:comments -->
+		<div class="wp-block-comments">
+			<!-- wp:comment-template -->
+			<!-- wp:comment-author-name /-->
+			<!-- wp:comment-date /-->
+			<!-- wp:comment-content /-->
+			<!-- wp:comment-reply-link /-->
+			<!-- /wp:comment-template -->
+			<!-- wp:comments-pagination -->
+			<!-- wp:comments-pagination-previous /-->
+			<!-- wp:comments-pagination-numbers /-->
+			<!-- wp:comments-pagination-next /-->
+			<!-- /wp:comments-pagination -->
+			<!-- wp:post-comments-form /-->
+		</div>
+		<!-- /wp:comments -->
+	</div>
+	<!-- /wp:group -->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer","tagName":"footer"} /-->