docs: add AGENTS.md

AGENTS.md

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+# AGENTS.md
+
+## Command pattern - always use RegisterCLICommand
+
+All new commands must use the struct-based pattern.
+**Do not copy the old flat `var cmd = &cobra.Command{...}` commands** - they
+exist in `cmd/storage/`, `cmd/dns/`, `cmd/dbaas/` and are legacy.
+
+Read this file before writing any new command:
+`cmd/aiservices/deployment/deployment_create.go`
+
+Skeleton:
+
+```go
+type myResourceCreateCmd struct {
+    exocmd.CliCommandSettings `cli-cmd:"-"`
+
+    _ bool `cli-cmd:"create"`
+
+    Name string `cli-arg:"#"  cli-usage:"NAME"`        // required positional
+    Tag  string `cli-arg:"?"  cli-usage:"TAG"`          // optional positional
+    Zone string `cli-short:"z" cli-usage:"zone"`        // becomes --zone / -z flag
+}
+
+func (c *myResourceCreateCmd) CmdAliases() []string { return exocmd.GCreateAlias }
+func (c *myResourceCreateCmd) CmdShort() string     { return "Create a resource" }
+func (c *myResourceCreateCmd) CmdLong() string      { return "..." }
+
+func (c *myResourceCreateCmd) CmdPreRun(cmd *cobra.Command, args []string) error {
+    exocmd.CmdSetZoneFlagFromDefault(cmd)
+    return exocmd.CliCommandDefaultPreRun(c, cmd, args)
+}
+
+func (c *myResourceCreateCmd) CmdRun(_ *cobra.Command, _ []string) error {
+    // c.Name, c.Zone are already populated here
+    return nil
+}
+
+func init() {
+    cobra.CheckErr(exocmd.RegisterCLICommand(parentCmd, &myResourceCreateCmd{
+        CliCommandSettings: exocmd.DefaultCLICmdSettings(),
+    }))
+}
+```
+
+Supported struct tags:
+
+| Tag | Purpose |
+|---|---|
+| `cli-cmd:"-"` | Exclude field from CLI processing |
+| `cli-cmd:"name"` | Sets the cobra command name (use on a `_ bool` field) |
+| `cli-arg:"#"` | Required positional argument |
+| `cli-arg:"?"` | Optional positional argument; `[]string` becomes variadic |
+| `cli-flag:"flag-name"` | Override the auto-derived kebab-case flag name |
+| `cli-short:"z"` | Single-character shorthand |
+| `cli-usage:"text"` | Flag usage string; also used as positional arg label in help |
+| `cli-hidden:""` | Mark flag hidden |
+| `cli-deprecated:"msg"` | Mark flag deprecated |
+
+Supported field types: `string`, `int64`, `bool`, `[]string`, `map[string]string`.
+Any other type panics at startup.
+
+Global alias vars to use for `CmdAliases()`:
+`exocmd.GListAlias`, `GShowAlias`, `GCreateAlias`, `GDeleteAlias`, `GRemoveAlias`.
+
+## Folder layout
+
+New command group:
+
+```
+cmd/<domain>/<subdomain>/
+  <subdomain>.go          <- var Cmd; init -> parent.AddCommand(Cmd)
+  <subdomain>_list.go
+  <subdomain>_show.go
+  <subdomain>_create.go
+  <subdomain>_delete.go
+  <subdomain>_list_test.go
+  ...
+```
+
+Then add a blank import to `cmd/subcommands/init.go` - nothing else needs wiring.
+
+## Tests
+
+Tests live in the same package (white-box). Construct the struct directly and
+call `CmdRun(nil, nil)`. Use `pkg/testutils` for HTTP test servers and client
+setup. See `cmd/aiservices/deployment/deployment_create_test.go`.
+
+## File header on every AI-touched file
+
+Add a comment at the top of every file you create or modify. Use the
+appropriate syntax for the language, and pick the right verb:
+
+```go
+// AI-generated by claude-sonnet-4.6 - not reviewed yet   // new file
+// AI-modified by claude-sonnet-4.6 - not reviewed yet    // existing file
+```
+```yaml
+# AI-generated by claude-sonnet-4.6 - not reviewed yet
+# AI-modified by claude-sonnet-4.6 - not reviewed yet
+```
+```html
+<!-- AI-generated by claude-sonnet-4.6 - not reviewed yet -->
+<!-- AI-modified by claude-sonnet-4.6 - not reviewed yet -->
+```
+
+The reviewer removes the line once they have read and approved the file.
+It must be the very first line (before `package`, shebangs, etc.) except
+where the language requires otherwise (e.g. after `<?xml` declarations).
+
+## Marking AI-assisted commits and PRs
+
+Add these trailers to every commit that contains agent-generated code:
+
+    AI-assisted: true
+    Co-authored-by: copilot-swe-agent <203248971+copilot-swe-agent@users.noreply.github.com>
+
+This makes AI-touched commits greppable across history:
+
+    git log --grep="AI-assisted"
+
+and shows Copilot as a co-author in GitHub's commit view.
+
+For PRs, append this footer to the description (after a `---`), listing only categories that apply:
+
+```
+> [!NOTE]
+> AI assistance: PR description, test scaffolding, boilerplate code.
+```
+
+Omit categories that don't apply. Omit the footer entirely if AI contributed nothing.
+
+## Before opening a PR or issue
+
+Use the existing templates - don't replace them with free-form text:
+- PRs: `.github/pull_request_template.md`
+- Issues: `.github/ISSUE_TEMPLATE/` (bug-report, feature_request, other_request)
+
+Keep every heading, fill each section in.
+
+## Before opening a PR
+
+```
+make build
+make test-verbose
+golangci-lint run --timeout 4m
+```
+
+Update `CHANGELOG.md` under `## Unreleased` with the PR number.