docs: add pull request template with cross-repo checklist

[mbevc1]

Adds pull_request_template.md so every PR gets a description prompt and a checklist reminding authors to check related surfaces: Helm chart (separate PR), Terraform provider, and docs.

[claude]

Claude finished @mbevc1's task in 27s —— View job

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PR Review: Add pull request template

• Read the changed file
• Verify prior review feedback was addressed
• Review content & conventions

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This is a docs-only change adding a single .github/pull_request_template.md. No Go code changed, so go build/go vet/go mod tidy are not applicable here.

Prior feedback is resolved ✅ — the earlier grammar issue (in a needs a separate PR) and the thise changes typo are both gone. Line 7 now reads cleanly:

- [ ] **Helm chart** (charts/k8s-reporter/) updated, if needed. Note: these changes live in a **separate PR**

Observations (all minor / optional):

1. Trailing punctuation is inconsistent across the checklist. Line 7 ends with a full sentence + period, while lines 8 and 9 have no terminating period. Consider making them uniform (e.g. add a period to each, or drop the one on line 7) for a tidy look.

2. .github/pull_request_template.md:9 — "Docs are autogenerated from CLI help" is a helpful reminder. You might optionally point contributors at the command that regenerates them (if one exists) so the reminder is actionable, but this is not blocking.

3. The cross-repo checklist (Helm, Terraform providers, docs) is a nice touch — the explicit repo links on line 8 are genuinely useful for reviewers who won't remember every downstream surface. 👍

Verdict: Content is clear, the checklist is well-scoped, and all previously raised comments have been addressed. Already approved by @AlexKantor87 — looks good to merge. Nice, low-risk quality-of-life improvement to the repo. 🎉
• 20260726_pr_template