Stage 3: Standard markdown integrations — 19 agents migrated to plugin architecture (#2038)

* Stage 3: Standard markdown integrations — 19 agents migrated to plugin architecture

Migrate all standard markdown integrations to self-contained subpackages
under integrations/. Each subclasses MarkdownIntegration with config-only
overrides (~10 lines per __init__.py).

Integrations migrated (19):
claude, qwen, opencode, junie, kilocode, auggie, roo, codebuddy,
qodercli, amp, shai, bob, trae, pi, iflow, kiro-cli, windsurf,
vibe, cursor-agent

Changes:
- Create integrations/<key>/ subpackage with __init__.py and scripts/
  (update-context.sh, update-context.ps1) for each integration
- Register all 19 in INTEGRATION_REGISTRY (20 total with copilot)
- MarkdownIntegration.setup() processes templates (replaces {SCRIPT},
  {ARGS}, __AGENT__; strips frontmatter blocks; rewrites paths)
- Extract install_scripts() to IntegrationBase; refactor copilot to use it
- Generalize --ai auto-promote from copilot-only to registry-driven:
  any integration registered in INTEGRATION_REGISTRY auto-promotes.
  Unregistered agents (gemini, tabnine, codex, kimi, agy, generic)
  continue through the legacy --ai path unchanged.
- Fix cursor/cursor-agent key mismatch in CommandRegistrar.AGENT_CONFIGS
- Add missing vibe entry to CommandRegistrar.AGENT_CONFIGS
- Update kiro alias test to reflect auto-promote behavior

Testing:
- Per-agent test files (test_integration_<agent>.py) with shared mixin
- 1316 tests passing, 0 failures
- Complete file inventory tests for both sh and ps variants
- Byte-for-byte validated against v0.4.3 release packages (684 files)

* Address PR review: fix repo root detection and no-op test

- Fix repo root fallback in all 20 update-context.sh scripts: walk up
  from script location to find .specify/ instead of falling back to pwd
- Fix repo root fallback in all 20 update-context.ps1 scripts: walk up
  from script location to find .specify/ instead of falling back to $PWD
- Add assertions to test_setup_writes_to_correct_directory: verify
  expected_dir exists and all command files reside under it

* Fix REPO_ROOT priority: prefer .specify walk-up over git root

In monorepos the git toplevel may differ from the project root that
contains .specify/. The previous fix still preferred git rev-parse
over the walk-up result.

Bash scripts (20): prefer the discovered _root when it contains
.specify/; only accept git root if it also contains .specify/.

PowerShell scripts (20): validate git root contains .specify/ before
using it; fall back to walking up from script directory otherwise.

* Guard git call with try/catch in PowerShell scripts

With $ErrorActionPreference = 'Stop', an unguarded git rev-parse
throws a terminating CommandNotFoundException when git is not
installed, preventing the .specify walk-up fallback from running.

Wrap the git call in try/catch across all 20 update-context.ps1
scripts so the fallback works reliably without git.

* Rename hyphenated package dirs to valid Python identifiers

Rename kiro-cli → kiro_cli and cursor-agent → cursor_agent so the
packages can be imported with normal Python syntax instead of
importlib.  The user-facing integration key (IntegrationBase.key)
stays hyphenated to match the actual CLI tool / binary name.

Also reorganize _register_builtins(): imports and registrations
are now grouped alphabetically with clear section comments.

* Reuse CommandRegistrar path rewriting in process_template()

Replace the duplicated regex-based path rewriting in
MarkdownIntegration.process_template() with a call to the shared
CommandRegistrar._rewrite_project_relative_paths() implementation.

This ensures extension-local paths are preserved and boundary rules
stay consistent across the codebase.

* Promote _rewrite_project_relative_paths to public API

Rename CommandRegistrar._rewrite_project_relative_paths() to
rewrite_project_relative_paths() (drop leading underscore) so
integrations can call it without reaching into a private method
across subsystem boundaries.

Addresses PR review feedback:
https://github.com/github/spec-kit/pull/2038#discussion_r3022105627

* Broaden TestRegistrarKeyAlignment to cover all integration keys

Parametrize across ALL_INTEGRATION_KEYS instead of only checking
cursor-agent and vibe.  Keeps a separate negative test for the
stale 'cursor' shorthand.

Addresses PR review feedback:
https://github.com/github/spec-kit/pull/2038#discussion_r3022269032

src/specify_cli/integrations/codebuddy/__init__.py

@@ -0,0 +1,21 @@
+"""CodeBuddy CLI integration."""
+
+from ..base import MarkdownIntegration
+
+
+class CodebuddyIntegration(MarkdownIntegration):
+    key = "codebuddy"
+    config = {
+        "name": "CodeBuddy",
+        "folder": ".codebuddy/",
+        "commands_subdir": "commands",
+        "install_url": "https://www.codebuddy.ai/cli",
+        "requires_cli": True,
+    }
+    registrar_config = {
+        "dir": ".codebuddy/commands",
+        "format": "markdown",
+        "args": "$ARGUMENTS",
+        "extension": ".md",
+    }
+    context_file = "CODEBUDDY.md"

src/specify_cli/integrations/codebuddy/scripts/update-context.ps1

@@ -0,0 +1,23 @@
+# update-context.ps1 — CodeBuddy integration: create/update CODEBUDDY.md
+#
+# Thin wrapper that delegates to the shared update-agent-context script.
+# Activated in Stage 7 when the shared script uses integration.json dispatch.
+#
+# Until then, this delegates to the shared script as a subprocess.
+
+$ErrorActionPreference = 'Stop'
+
+# Derive repo root from script location (walks up to find .specify/)
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$repoRoot = try { git rev-parse --show-toplevel 2>$null } catch { $null }
+# If git did not return a repo root, or the git root does not contain .specify,
+# fall back to walking up from the script directory to find the initialized project root.
+if (-not $repoRoot -or -not (Test-Path (Join-Path $repoRoot '.specify'))) {
+    $repoRoot = $scriptDir
+    $fsRoot = [System.IO.Path]::GetPathRoot($repoRoot)
+    while ($repoRoot -and $repoRoot -ne $fsRoot -and -not (Test-Path (Join-Path $repoRoot '.specify'))) {
+        $repoRoot = Split-Path -Parent $repoRoot
+    }
+}
+
+& "$repoRoot/.specify/scripts/powershell/update-agent-context.ps1" -AgentType codebuddy

src/specify_cli/integrations/codebuddy/scripts/update-context.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# update-context.sh — CodeBuddy integration: create/update CODEBUDDY.md
+#
+# Thin wrapper that delegates to the shared update-agent-context script.
+# Activated in Stage 7 when the shared script uses integration.json dispatch.
+#
+# Until then, this delegates to the shared script as a subprocess.
+
+set -euo pipefail
+
+# Derive repo root from script location (walks up to find .specify/)
+_script_dir="$(cd "$(dirname "$0")" && pwd)"
+_root="$_script_dir"
+while [ "$_root" != "/" ] && [ ! -d "$_root/.specify" ]; do _root="$(dirname "$_root")"; done
+if [ -z "${REPO_ROOT:-}" ]; then
+  if [ -d "$_root/.specify" ]; then
+    REPO_ROOT="$_root"
+  else
+    git_root="$(git rev-parse --show-toplevel 2>/dev/null || true)"
+    if [ -n "$git_root" ] && [ -d "$git_root/.specify" ]; then
+      REPO_ROOT="$git_root"
+    else
+      REPO_ROOT="$_root"
+    fi
+  fi
+fi
+
+exec "$REPO_ROOT/.specify/scripts/bash/update-agent-context.sh" codebuddy