chore(sdlc): configure dependabot, codeowners, and templates

Author: Aitomates

.github/CODEOWNERS

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+* @Coding-Autopilot-System/core

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/pull_request_template.md

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+## Intent
+
+<!-- Explain the problem and the smallest coherent solution. -->
+
+## Changes
+
+<!-- List the behavior changed. Avoid a file inventory. -->
+
+## Risk And Safety
+
+- [ ] Permissions, identities, secrets, and data boundaries were reviewed.
+- [ ] AI-generated output and autonomous behavior were reviewed by a human.
+- [ ] No credentials, personal data, proprietary code, or sensitive prompts were added.
+- [ ] Breaking changes and migration requirements are documented.
+
+## Verification
+
+<!-- Include exact commands and meaningful results. -->
+
+- [ ] Tests, linting, and repository validation pass.
+- [ ] Documentation and examples match actual behavior.
+
+## Rollback
+
+<!-- Explain how to safely revert or disable this change. -->
+
+## Reviewer Focus
+
+<!-- Identify the highest-risk decisions and files. -->