Generate Lab D's task table instead of using a Liquid include

The landing page called {% include lab-tasks-table.html lab='D' %}, written
when that include existed on the PoC branch. It never reached main: lab pages
are read directly by platforms that don't render Liquid, so A, B and C now
carry a real markdown table written by tools/generate_lab_blocks.py between
HTML comment markers. Lab D now follows the same pattern.

Also drops the core duration from the intro prose, which restated a number
the generated block already gives. A, B and C had the same line removed for
the same reason - one source for the timings, not two.

Verified against main's tooling: all Tier 0 checks pass, --check is clean,
and sync.py reports 4 labs in sync with no files updated, confirming the
generated infrastructure matches the canonical source byte for byte.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: dc4690cc-57d6-48a7-abc8-bc8570113ab1

Author: ivorb

Instructions/Consolidated/D-observe-evaluate-and-secure-agents.md

@@ -122,11 +122,19 @@ one virtual environment, and one `.env`, so if you'd rather work straight throug
 
 ## Lab at a glance
 
-Complete the **Core** tasks first (about **1 hour**) — they end with an agent you can see
+Complete the **Core** tasks first — they end with an agent you can see
 inside and a scorecard for its answers. Then add the **Optional** task if you want to test
 how it stands up to attack.
 
-{% include lab-tasks-table.html lab='D' %}
+<!-- BEGIN GENERATED: task-table - do not edit by hand; run: python tools/generate_lab_blocks.py -->
+| Section | Task | Level | Time |
+| --- | --- | --- | --- |
+| **Core** | [Task 1 – Trace your agent](D1-trace-your-agent.md) | ▰▰▰▱▱ L300 | ~25 min |
+| **Core** | [Task 2 – Evaluate answer quality](D2-evaluate-answer-quality.md) | ▰▰▰▱▱ L300 | ~35 min |
+| *Optional* | [Task 3 – Red team your agent](D3-red-team-your-agent.md) | ▰▰▰▰▱ L400 | ~35 min |
+
+**Core tasks:** about **60 minutes**. **Full lab**, including every optional task: about **1 hour 35 minutes**.
+<!-- END GENERATED: task-table -->
 
 **Choosing your path** — pick the tasks that fit the time you have: