docs: add AGENTS.md for AI agent guidance (#837)

* feat: add AGENNTS.md

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: update based on copilot feedback

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: update AGENTS.md

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: update based on AI suggestion

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: based on comments

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: some files

Signed-off-by: Andy Lee <andy.lee@suse.com>

* refactor: boundaries.md

Signed-off-by: Andy Lee <andy.lee@suse.com>

---------

Signed-off-by: Andy Lee <andy.lee@suse.com>

docs/agents.md/contributors/resolving_gh_issues.md

@@ -0,0 +1,58 @@
+## Milestone guidance
+
+- All issues must first be resolved in the `main` branch
+- If backports are needed they can be made via the backport bot
+  - pull requests
+    - comment `@Mergifyio backport <target branch>` e.g. `@Mergifyio backport release-harvester-v1.8`
+    - All backported pull requests must link to a backported issue
+
+
+## Creating a branch
+
+### To resolve an issue
+- Checkout the branch matching the milestone of the issue `git checkout ${targetMilestoneBranch}`. Replace `${targetMilestoneBranch}` with the target milestone of the issue. For example
+  - `main` for the latest unreleased minor version
+  - `release-harvester-v.X` for release minor versions
+    - `release-harvester-v1.6`
+    - `release-harvester-v1.7`
+    - `release-harvester-v1.8`
+- Ensure you have the latest of that branch `git pull --rebase`
+- Checkout the branch to commit the changes to `git checkout issue-${issueNumber}`. Replace `${issueNumber}` with the issue number.
+
+## Creating a commit
+
+- This project uses commit-lint with [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) to ensure consistent and meaningful commit messages.
+
+### Commit Message Format
+All commit messages must follow the conventional commit format:
+```
+<type>[optional scope]: <description>
+
+[optional body]
+
+[optional footer(s)]
+```
+
+### Supported Types
+- feat: New features
+- fix: Bug fixes
+- docs: Documentation changes
+- style: Code style changes (formatting, missing semicolons, etc.)
+- refactor: Code refactoring
+- perf: Performance improvements
+- test: Adding or updating tests
+- build: Build system or external dependencies
+- ci: CI/CD changes
+- chore: Other changes that don't modify src or test files
+- revert: Reverts a previous commit
+- wip: Work in progress
+- deps: Dependency updates
+- security: Security fixes
+
+## Creating a Pull Request
+
+- Pull requests must come from forks
+- Description should always have commit supported type prefix. E.g `fix: XXX`, `feat: OOO`
+- A Pull Request will only be merged once
+  - ALL CI gates have passed
+  - At least one harvester/harvester-ui-extension code owners reviews and approves the PR