Tweak The Mobile PR Builder Skill (Part Two)

[conroy-ricketts]

Based on feedback from the mobile dev team, I tweaked/improved the mobile PR builder skill.

Summary of the changes:

• Draft mode, no review-and-approve loop. The "show draft, wait for approval" step is gone. The skill now opens the PR with --draft and the user iterates on GitHub.
• No reviewers requested. --reviewer dimagi/connect-mobile-devs removed; reviewer selection is the user's job once they un-draft.
• QA notes go to RELEASES.md. New step 4 appends bullets to the QA Notes subsection of the most recent CommCare X.YZ release and commits the change on the branch. The PR description's QA Plan section becomes a pointer to RELEASES.md.
• QA notes constrained to phone-only access. Explicit list of forbidden tooling (Android Studio, Logcat, adb, unit/instrumentation tests, internal storage inspection, source code) plus guidance to write user-level actions and observable outcomes only.
• Neutral safety story. Replaced the "argue why it's safe" framing with two lists: What gives confidence (only items actually true) and risks to review (honest, unmitigated risks left visible for the reviewer to weigh).
• Explicit ask for the author's personal testing. New step 3 requires the skill to ask the user what they did to verify the change before generating the description, and forbids fabricating testing they did not describe.
• Common mistakes list updated to match.
• Moved the skill to the dev_utils plugin since both CommCare and Connect divisions can use it.
• Updated the plugins README.

[conroy-ricketts]

I plan on testing this new version of the skill on a real feature I'm working on soon - planning not to merge this PR until I test it.

[conroy-ricketts]

@shubham1g5 @Jignesh-dimagi @OrangeAndGreen

Finally tested this with a new PR created here: dimagi/commcare-android#3686

Based on that, I made another slight tweak to this skill in the latest commit: d5d06a3