feat: enforce hard test-tier requirement across all DevPlace workflow agents and feature-builder docs

Update the feature-builder agent prompt, test-maintainer agent, and all four workflow JS files (devii-tool, endpoint, feature, job-service) to codify the DevPlace test standard as a non-optional project requirement: one test file per endpoint, directory tree mirroring the URL/source path, split into three tiers (unit, api, e2e). Add explicit Test phases to devii-tool, endpoint, feature, and job-service workflows, and embed tier-specific test instructions (path mapping, fixture choice, coverage scope) directly in each workflow's meta description and TESTS constant.

devplacepy/templates/project_detail.html

@@ -67,7 +67,7 @@
         {% endif %}
 
         <div class="project-detail-actions">
-            <a href="/projects/{{ project['slug'] or project['uid'] }}/files" class="project-star-btn"><span class="icon">&#x1F4C1;</span> Files</a>
+            <a href="/projects/{{ project['slug'] or project['uid'] }}/files" class="project-star-btn"><span class="icon">&#x1F4C1;</span> Files ({{ file_count }} files)</a>
             <button type="button" class="project-star-btn" data-share="/projects/{{ project['slug'] or project['uid'] }}"><span class="icon">&#x1F517;</span> Share</button>
             {% if user %}
             {% set _type = "project" %}{% set _uid = project['uid'] %}{% set _my_vote = my_vote %}{% set _count = star_count %}{% set _btn_class = "project-star-btn" %}{% include "_star_vote.html" %}