CI: align named-overprint intent coverage across QA surfaces

[xsscx]

PR Summary

#2342

Checklist

• Signed all Commits in PR
• Built locally according to docs/build.md
• Followed the guidelines in Contributing document
• Ran relevant CTest/profile tests from docs/ctest.md
• Updated documentation for user-visible behavior changes
• Ran sanitizer coverage for memory-safety or parser changes
• Added or updated regression coverage for behavior changes
• Attached a base...HEAD contract matrix for cross-cutting changes:
  producer, consumer, build/runtime behavior, platform/toolchain boundary,
  CI trigger, dependency owner, and local evidence
• Reviewed active and suppressed automated findings from review threads and summaries
• For Python package changes, followed docs/python-packaging-release.md for PR and merge requirements
• Did not change maintainer-owned workflow, CTest, CPack, sanitizer, release, or security infrastructure unless requested by an iccDEV maintainer
• New source files include the ICC copyright and BSD 3-Clause license header
• Code style matches nearby code: 2-space indent, K&R braces, m_ members

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Maintainer Review Required

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[Copilot]

Pull request overview

Aligns CI/CTest and maintainer guidance so legacy packed intent decoding + named-color overprint coverage is consistently called out across docs, prompts, skills, and the JSON CLI exercise harness.

Changes:

• Document the iccdev.applynamedcmm-cli-args and iccdev.applysearch-cli-args CTest suites in docs/ctest.md.
• Add/propagate maintainer guidance to include the ApplyNamedCmm/ApplySearch CLI-args regressions alongside the named-color overprint regression.
• Extend .github/scripts/json-cli-exercise.sh with a new group exercising named overprint intents and transform enums.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/ctest.md	Adds the missing CTest suite entries for the CLI-args regression scripts.
AGENTS.md	Adds a ground-rule reminder to keep overprint/packed-intent coverage aligned across the named regressions.
.github/skills/maintainer-ci-ctest/SKILL.md	Updates maintainer CTest selection guidance to include the relevant regressions for this behavior area.
.github/scripts/json-cli-exercise.sh	Adds a new JSON CLI exercise group for named overprint intent + transform enum coverage.
.github/prompts/maintainer-ci-ctest.prompt.md	Updates the maintainer prompt to explicitly include the overprint/packed-intent focused validations.
.github/copilot-instructions.md	Adds the overprint + CLI-args regression scripts to the canonical list.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.