feat(mcp): add PowerShell shell completion

packages/gittensory-mcp/README.md

@@ -49,6 +49,7 @@ gittensory-mcp init-client --print codex --agent-profile miner-planner
 gittensory-mcp completion bash
 gittensory-mcp completion zsh
 gittensory-mcp completion fish
+gittensory-mcp completion powershell
 gittensory-mcp decision-pack --login jsonbored --json
 gittensory-mcp repo-decision --login jsonbored --repo we-promise/sure --json
 gittensory-mcp analyze-branch --login jsonbored --json
@@ -79,7 +80,7 @@ Add `--json` for machine-readable output:
 
 ### Shell completion
 
-`gittensory-mcp completion <bash|zsh|fish>` prints a tab-completion script for your shell. It completes top-level commands and the subcommands of `profile`, `cache`, and `agent`. Add `--json` to get `{ "shell": "...", "script": "..." }` for tooling.
+`gittensory-mcp completion <bash|zsh|fish|powershell>` prints a tab-completion script for your shell. It completes top-level commands and the subcommands of `profile`, `cache`, `agent`, and `maintain`. Add `--json` to get `{ "shell": "...", "script": "..." }` for tooling.
 
 ```sh
 # bash (add to ~/.bashrc)
@@ -92,6 +93,11 @@ source <(gittensory-mcp completion zsh)
 gittensory-mcp completion fish > ~/.config/fish/completions/gittensory-mcp.fish
 ```
 
+```powershell
+# PowerShell (add to your $PROFILE)
+gittensory-mcp completion powershell | Out-String | Invoke-Expression
+```
+
 For near-term what-if scoreability, pass the situational assumptions explicitly:
 
 ```sh

packages/gittensory-mcp/bin/gittensory-mcp.js

@@ -44,7 +44,7 @@ const CLI_COMMAND_SPEC = {
   agent: ["plan", "status", "explain", "packet"],
   maintain: ["status", "approve", "reject", "pause", "resume", "set-level"],
 };
-const COMPLETION_SHELLS = ["bash", "zsh", "fish"];
+const COMPLETION_SHELLS = ["bash", "zsh", "fish", "powershell"];
 const AGENT_PROFILE_IDS = ["miner-planner", "miner-auto-dev", "maintainer-triage", "repo-owner-intake"];
 // #784 maintain set-level — the autonomy dial's action classes + levels (must mirror src/settings/autonomy.ts).
 const MAINTAIN_ACTION_CLASSES = ["review", "request_changes", "approve", "merge", "close", "label"];
@@ -1674,7 +1674,8 @@ function buildCompletionScript(shell) {
   const withSubcommands = Object.entries(CLI_COMMAND_SPEC).filter(([, subcommands]) => subcommands.length > 0);
   if (shell === "bash") return buildBashCompletion(topLevel, withSubcommands);
   if (shell === "zsh") return buildZshCompletion(topLevel, withSubcommands);
-  return buildFishCompletion(topLevel, withSubcommands);
+  if (shell === "fish") return buildFishCompletion(topLevel, withSubcommands);
+  return buildPowershellCompletion(topLevel, withSubcommands);
 }
 
 function buildBashCompletion(topLevel, withSubcommands) {
@@ -1735,11 +1736,40 @@ ${topLevelLines}
 ${subcommandLines}`;
 }
 
+function buildPowershellCompletion(topLevel, withSubcommands) {
+  const commandList = topLevel.map((command) => `'${command}'`).join(", ");
+  const subcommandEntries = withSubcommands
+    .map(([command, subcommands]) => `    '${command}' = @(${subcommands.map((subcommand) => `'${subcommand}'`).join(", ")})`)
+    .join("\n");
+  return `# gittensory-mcp PowerShell completion. Add to your $PROFILE:
+#   gittensory-mcp completion powershell | Out-String | Invoke-Expression
+Register-ArgumentCompleter -Native -CommandName gittensory-mcp -ScriptBlock {
+  param($wordToComplete, $commandAst, $cursorPosition)
+  $commands = @(${commandList})
+  $subcommands = @{
+${subcommandEntries}
+  }
+  $elements = $commandAst.CommandElements
+  if ($elements.Count -le 2) {
+    $commands | Where-Object { $_ -like "$wordToComplete*" } | ForEach-Object {
+      [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterValue', $_)
+    }
+    return
+  }
+  $sub = $subcommands[[string]$elements[1].Value]
+  if ($sub) {
+    $sub | Where-Object { $_ -like "$wordToComplete*" } | ForEach-Object {
+      [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterValue', $_)
+    }
+  }
+}`;
+}
+
 function printHelp() {
   process.stdout.write(`Usage:
   gittensory-mcp --stdio
   gittensory-mcp version [--json]
-  gittensory-mcp completion bash|zsh|fish [--json]
+  gittensory-mcp completion bash|zsh|fish|powershell [--json]
   gittensory-mcp login [--profile name] [--github-token <token>] [--json]
   gittensory-mcp logout [--profile name] [--all] [--json]
   gittensory-mcp whoami [--profile name] [--json]

test/unit/mcp-cli-basics.test.ts

@@ -176,15 +176,23 @@ describe("gittensory-mcp CLI — basics", () => {
     expect(fish).toContain("__fish_seen_subcommand_from agent");
   });
 
+  it("prints a PowerShell argument-completer script", () => {
+    const ps = run(["completion", "powershell"]);
+    expect(ps).toContain("Register-ArgumentCompleter -Native -CommandName gittensory-mcp");
+    expect(ps).toContain("[System.Management.Automation.CompletionResult]::new");
+    expect(ps).toContain("$commands = @('login', 'logout'");
+    expect(ps).toContain("'maintain' = @('status', 'approve', 'reject', 'pause', 'resume', 'set-level')");
+  });
+
   it("emits completion as machine-readable json", () => {
     const payload = JSON.parse(run(["completion", "zsh", "--json"])) as { shell: string; script: string };
     expect(payload.shell).toBe("zsh");
     expect(payload.script).toContain("#compdef gittensory-mcp");
   });
 
   it("rejects missing or unsupported completion shells", () => {
-    expect(() => run(["completion"])).toThrow(/Usage: gittensory-mcp completion <bash\|zsh\|fish>/);
-    expect(() => run(["completion", "powershell"])).toThrow(/Unsupported shell: powershell/);
+    expect(() => run(["completion"])).toThrow(/Usage: gittensory-mcp completion <bash\|zsh\|fish\|powershell>/);
+    expect(() => run(["completion", "tcsh"])).toThrow(/Unsupported shell: tcsh/);
   });
 
   it("reports resolved configuration provenance via config", () => {