docs: warn against deploying to the default namespace

[alexeykazakov]

• Add note in Quick Start explaining that the default namespace on OpenShift uses a different SCC assignment that may skip runAsUser injection, causing runAsNonRoot verification failures for images with non-numeric USER directives

• Rename the default my-claw-namespace NS to my-claw NS

Summary by CodeRabbit

• Documentation
  • Added guidance for OpenShift users regarding namespace configuration best practices. Documentation now warns against using the default namespace and recommends creating a dedicated namespace to prevent security context constraint complications and ensure proper handling of container specifications and runtime verification.

[coderabbitai]

Walkthrough

Updated README to introduce NS as a reusable variable across commands, added an OpenShift-specific warning about avoiding the default namespace due to SCC/runAsUser behavior, and changed the Makefile default NS from my-claw-namespace to my-claw.

Changes

Cohort / File(s)	Summary
Documentation README.md	Introduced reusable NS usage in setup instructions and added an OpenShift warning advising against using the default namespace because SCC may not inject numeric runAsUser, causing runAsNonRoot verification failures for images with non-numeric USER values.
Makefile Makefile	Changed default namespace variable from NS ?= my-claw-namespace to NS ?= my-claw, affecting targets that use $(NS) unless overridden on the command line.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change in the pull request - adding a warning against using the default namespace in the README documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[xcoulon]

Nice, thanks!