docs: add Copilot code-review instructions

[devantler]

🤖 Generated by the Daily AI Assistant

What

Adds .github/copilot-instructions.md to go-template — the file GitHub Copilot code review reads (repo-wide; it does not read AGENTS.md).

Why

Part of the portfolio-wide rollout tracked in monorepo#1771: every repo should carry a concise, review-focused copilot-instructions.md so Copilot reviews enforce house conventions. go-template had none, so Copilot reviewed its PRs with no project context.

Scope & shape

• 2718 chars (≤ 4000 — Copilot review truncates beyond that).
• Short, imperative, review-oriented rules — not a dump of AGENTS.md. Distils the go-template-specific enforce-points: template-not-a-product altitude, go.mod as the single source of truth for the Go version, golangci-lint v2 fmt+run, Conventional-Commit PR titles (squash → changelog), actionlint + SHA-pinned actions + least-privilege permissions:, no check-weakening, no hand-edited generated files.
• Cross-references AGENTS.md and states the keep-in-sync rule both ways.
• Docs-only; no code or workflow changes.

Created via the GitHub Contents API (no local checkout). Advances #1771 (go-template box).

[Copilot]

Pull request overview

Adds repository-wide GitHub Copilot code review instructions via .github/copilot-instructions.md, intended to capture go-template’s house review conventions (template minimalism, Go/toolchain source-of-truth, golangci-lint v2 usage, workflow hygiene) in a concise format that Copilot review will actually read.

Changes:

• Introduces .github/copilot-instructions.md with review-focused guidance specific to devantler-tech/go-template.
• Aligns key review expectations with AGENTS.md (single source of truth for Go version, lint/format expectations, workflow pinning/permissions, etc.).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	6		0	0	0.3s
✅ ACTION	zizmor	6	0	0	0	2.0s
✅ COPYPASTE	jscpd	yes		no	no	1.07s
✅ EDITORCONFIG	editorconfig-checker	28		0	0	0.04s
✅ GO	golangci-lint	yes	yes	no	no	21.23s
✅ JSON	jsonlint	1		0	0	0.39s
✅ JSON	prettier	1	0	0	0	0.48s
✅ JSON	v8r	1		0	0	2.21s
✅ MARKDOWN	markdownlint	5	0	0	0	1.04s
✅ MARKDOWN	markdown-table-formatter	5	0	0	0	0.27s
✅ REPOSITORY	checkov	yes		no	no	28.99s
✅ REPOSITORY	gitleaks	yes		no	no	0.12s
✅ REPOSITORY	git_diff	yes		no	no	0.01s
✅ REPOSITORY	grype	yes		no	no	58.34s
✅ REPOSITORY	osv-scanner	yes		no	no	2.1s
✅ REPOSITORY	secretlint	yes		no	no	0.88s
✅ REPOSITORY	syft	yes		no	no	1.46s
✅ REPOSITORY	trivy	yes		no	no	11.87s
✅ REPOSITORY	trivy-sbom	yes		no	no	0.21s
✅ REPOSITORY	trufflehog	yes		no	no	3.99s
✅ SPELL	lychee	16		0	0	1.1s
✅ YAML	prettier	10	0	0	0	0.74s
✅ YAML	v8r	10		0	0	14.04s
✅ YAML	yamllint	10		0	0	0.77s

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