chore(go): audit providers copilot droid augment cline

Move the four providers onto managed_runtime.go and shell_command.go;
keep the Auggie wrappers, Cline metadata wrappers, and the Copilot and
Droid precondition handling provider-local.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

cmd/elydora/plugins/augment_contract.go

@@ -12,11 +12,10 @@ import (
 )
 
 const (
-	augmentAgentKey        = "augment"
-	augmentGuardScript     = "guard.js"
-	augmentAuditScript     = "hook.js"
-	augmentHookTimeout     = float64(10_000)
-	augmentPOSIXApostrophe = `'"'"'`
+	augmentAgentKey    = "augment"
+	augmentGuardScript = "guard.js"
+	augmentAuditScript = "hook.js"
+	augmentHookTimeout = float64(10_000)
 )
 
 var (
@@ -314,23 +313,8 @@ func readAugmentWindowsArgument(command string) (string, bool) {
 }
 
 func readAugmentPOSIXArgument(command string) (string, bool) {
-	if len(command) < 2 || command[0] != '\'' {
-		return "", false
-	}
-	var value strings.Builder
-	for index := 1; index < len(command); {
-		if strings.HasPrefix(command[index:], augmentPOSIXApostrophe) {
-			value.WriteByte('\'')
-			index += len(augmentPOSIXApostrophe)
-			continue
-		}
-		if command[index] == '\'' {
-			return value.String(), index == len(command)-1 && value.Len() > 0
-		}
-		value.WriteByte(command[index])
-		index++
-	}
-	return "", false
+	value, end, ok := readPOSIXArgument(command, 0)
+	return value, ok && end == len(command) && value != ""
 }
 
 func parseAugmentCommand(command string) (string, bool) {
@@ -340,36 +324,6 @@ func parseAugmentCommand(command string) (string, bool) {
 	return readAugmentPOSIXArgument(command)
 }
 
-func normalizeAugmentPath(value string) string {
-	absolute, err := filepath.Abs(value)
-	if err == nil {
-		value = absolute
-	}
-	value = filepath.ToSlash(filepath.Clean(value))
-	if runtime.GOOS == "windows" {
-		return strings.ToLower(value)
-	}
-	return value
-}
-
-func sameAugmentPath(left, right string) bool {
-	return normalizeAugmentPath(left) == normalizeAugmentPath(right)
-}
-
-func sameAugmentAgentID(left, right string) bool {
-	if runtime.GOOS == "windows" {
-		return strings.EqualFold(left, right)
-	}
-	return left == right
-}
-
-func sameAugmentFileName(left, right string) bool {
-	if runtime.GOOS == "windows" {
-		return strings.EqualFold(left, right)
-	}
-	return left == right
-}
-
 func managedAugmentAgentID(
 	handler map[string]any,
 	wrapperName, runtimeRoot string,
@@ -385,11 +339,11 @@ func managedAugmentAgentID(
 		return "", false
 	}
 	wrapperPath, ok := parseAugmentCommand(command)
-	if !ok || !sameAugmentFileName(filepath.Base(wrapperPath), wrapperName) {
+	if !ok || !sameManagedName(filepath.Base(wrapperPath), wrapperName) {
 		return "", false
 	}
 	agentDirectory := filepath.Dir(wrapperPath)
-	if !sameAugmentPath(filepath.Dir(agentDirectory), runtimeRoot) {
+	if !sameManagedPath(filepath.Dir(agentDirectory), runtimeRoot) {
 		return "", false
 	}
 	agentID := filepath.Base(agentDirectory)
@@ -407,7 +361,7 @@ func removeManagedAugmentGroups(
 		groupChanged := false
 		for _, handler := range group.handlers {
 			managedID, managed := managedAugmentAgentID(handler, wrapperName, runtimeRoot)
-			remove := managed && (agentID == "" || sameAugmentAgentID(managedID, agentID))
+			remove := managed && (agentID == "" || sameManagedAgentID(managedID, agentID))
 			if remove {
 				changed = true
 				groupChanged = true