feat(extensions): add assess idea assessment pipeline extension

Add a role-neutral, opt-in "Idea Assessment Pipeline" extension (id:
assess) covering the discovery work that happens BEFORE spec-driven
development. It provides a five-stage funnel: intake, research, define,
shape, decide, each writing one artifact under
.specify/assessments/<slug>/. A go verdict hands off to
/speckit.specify; killing an idea is a first-class success outcome.

Registration:
- extensions/catalog.json: bundled core opt-in entry (before bug)
- pyproject.toml: force-include maps into core_pack so it ships in the
  installed wheel (verified via wheel build)

Also normalizes a Rich-wrapped substring assertion in test_workflows.py
so the suite passes at CI's 80-column non-TTY width.

Assisted-by: GitHub Copilot (model: Claude Opus 4.8, supervised)
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 1f25cf9d-b7eb-4b2b-b811-3e91d8db8f6a

tests/test_workflows.py

@@ -9027,10 +9027,12 @@ steps:
 
         assert result.exit_code != 0
         assert result.exception is None or isinstance(result.exception, SystemExit)
-        # Original download error remains present.
-        assert "exceedsthe100-byteworkflowsizelimit" in "".join(result.output.split())
+        # Original download error remains present. Normalize whitespace so the
+        # assertion is robust to Rich line-wrapping at narrow terminal widths.
+        normalized_output = "".join(result.output.split())
+        assert "exceedsthe100-byteworkflowsizelimit" in normalized_output
         # Cleanup failure is reported too, not silently swallowed / crashing.
-        assert "cleanup denied" in result.output
+        assert "cleanupdenied" in normalized_output
         assert "Warning" in result.output
         assert not WorkflowRegistry(project_dir).is_installed("align-wf")