docs: add Tekton step-count and resource optimization guidance

Add a Resource optimization subsection to .cursor/rules/tekton.mdc
to help review and code agents suggest step consolidation. Tekton
computes pod resource requirements as the sum of all step requests,
so minimizing step count reduces scheduling overhead.

Closes #3675

Assisted-by: Claude Opus 4.6
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: fullsend-code <278716306+fullsend-ai-coder[bot]@users.noreply.github.com>

Author: 2 people

.cursor/rules/tekton.mdc

@@ -15,6 +15,11 @@ description: Rules how to write great tekton tasks and pipelines
 ### Security
 - never use tekton parameters as "$(params.*)" directly in the script, make tekton env variable first in tekton task definition and use env variable in the script
 
+### Resource optimization
+- Tekton computes pod resource requirements as the sum of all step resource requests, not the maximum — minimize step count to reduce scheduling overhead in resource-constrained clusters
+- consolidate steps that share the same base image and run sequentially, especially lightweight post-processing steps such as result reporting or artifact uploading
+- when a step only writes a Tekton result value (e.g. `$(results.*.path)`), merge it into the preceding step rather than running a separate container
+
 ## Script
 - if a user hasn't specified otherwise, default script language is bash
 - add the shebang of the script language to the script